FAQ and Buying Guide
FAQ (Frequently Asked Questions): most frequently asked questions
The most comprehensive buying guide to help you choose the right wave measuring device
or its protection against electromagnetic waves.
How to measure electromagnetic waves?
Which electromagnetic wave measuring device should you choose?
What is the best device to measure waves simply?
How to choose the right device for measuring electromagnetic waves?
What is the difference between a wave detector and a wave measuring device?
What are the most effective electromagnetic wave protections?
What are the differences between the ESI22, ESI23 and ESI24 wave detectors? Which one to choose?
Which Gigahertz Solutions brand low-frequency electromagnetic wave measuring instrument should I choose?
Which Gigahertz Solutions brand high frequency electromagnetic wave measuring device
or which brand TES to choose?
How does a CPL filter work and which one to choose?
Which anti-electromagnetic wave paint should you choose?
Which anti-wave film should you choose for windows or glass surfaces?
How to choose the right protection against electromagnetic waves?
Correspondence between attenuation in dB and reduction in % of the intensity of the electromagnetic field
CEM Diagnostic Shop - Buying Guide and FAQ:
Why buy my wave detector or electromagnetic wave measuring device from the Diagnostic CEM online store?
- Free delivery from 200€ purchase (delivery in the European Union)
- Secure payment (by credit card or Paypal)
- Best price
- Quality and reliability of devices selected by Diagnostic CEM
- Payment in 4x by Paypal, payment in installments by Klarna
Diagnostic CEM has selected for you, following numerous tests and trials carried out in its laboratory, the best devices for measuring electromagnetic waves (Gigahertz Solutions, EPE Conseil, Tenmars, etc.).
CEM: Electromagnetic Fields
Why buy my electromagnetic wave protection in the Diagnostic CEM store?
All the electromagnetic wave protection products offered by the Diagnostic CEM anti-wave store have been tested by independent laboratories to validate their effectiveness. The electromagnetic wave protections from the Diagnostic CEM store are effective products for protecting yourself from waves. Diagnostic CEM has selected the best brands of electromagnetic wave protection for you (YShield, Swiss Shield, Danell, Polier, etc.).
To which destinations does Diagnostic CEM ship the products from its online store? From which countries can customers order from the Diagnostic CEM online store?
We ship our products to the following countries:
- France (including Corsica and Overseas), Andorra and Monaco
- Belgium and Luxembourg
- Switzerland and Liechtenstein
- Germany and Austria
- Italy (including Vatican and San Marino)
- The Netherlands
- Spain (including Balearic Islands, Canary Islands, Ceuta and Melilla)
- Portugal (including Azores and Madeira)
- United Kingdom (England, Scotland, Wales, Northern Ireland) and Ireland
- Eastern Europe, Scandinavia, Greece, Cyprus
- Israel, Türkiye, Middle East, India, Pakistan
- United States, Canada, Australia, New Zealand, Oceania
- Algeria, Morocco, Tunisia, Africa
- Mexico and Central America
- Jamaica, Dominican Republic, Puerto Rico, Bahamas and Caribbean Islands
- Brazil, Argentina, South America
For customers located in the United Kingdom or in states or territories in our delivery area that are not members of the European Union Customs Union, there may be customs duties to be paid upon receipt of the package in addition to the product prices displayed in the Diagnostic CEM online store: www.diagnostic-cem.shop. Contact your local authorities for more details.
For customers located outside our shipping area, please contact us so that we can calculate the exact shipping costs for the product(s) you wish to order from the Diagnostic CEM online store.
What are low and high frequency electromagnetic waves?
There are two main types of electromagnetic waves:
- low frequency waves
- high frequency (or hyperfrequency) waves
Low-frequency electromagnetic waves are produced by electrical devices, high-voltage (HV) and extra-high-voltage (EHV) power lines, electrical transformer stations (electrical transformers), railway, metro and tramway catenaries, communicating or non-communicating electricity meters and electricity in general.
High frequency electromagnetic waves are generated by:
- television broadcasting (DTT) and radio broadcasting (FM)
- GSM, UMTS (3G), LTE (4G), 5G telephony
- DECT cordless home telephony
- Wi-Fi networks and Bluetooth
- microwave ovens
- CB and amateur or professional radio communications (PMR, TETRA, etc.)
- Radar systems
What units of measurement are used to quantify electromagnetic waves?
For low frequency electromagnetic waves, we measure:
- the electric field (in V/m)
- the magnetic field (in nT - nanoTesla - or in mG - milliGauss)
Regarding high frequency electromagnetic waves, we measure:
- the electric field (in V/m or in µW/m2)
Par exemple : 1999 µW/m2 = 0,868 V/m et 19 990 µW/m2 = 2,745 V/m
How to measure electromagnetic waves? Choosing a wave detector or an electromagnetic wave measuring device?
There are two main families of devices for detecting or measuring electromagnetic waves:
- electromagnetic wave detectors
- electromagnetic wave measuring devices
Electromagnetic wave detectors are used to quantify a level of exposure to electromagnetic pollution. Wave measuring devices give a numerical value in a given unit concerning the measured electromagnetic field.
What is an electromagnetic wave detector?
An electromagnetic wave detector is an instrument used to assess the intensity level of electromagnetic waves. Through colored LEDs (green, yellow or red), it indicates the level of exposure to waves, for example:
- green: low level, no risk
- yellow: medium level, risk present
- red: high level, significant exposure to waves, danger
Electromagnetic wave detectors are small, portable devices that fit easily into a pocket, so you can take them anywhere with you. They allow you to quickly assess the electromagnetic pollution in your environment. To know which range of numerical values a colored LED corresponds to, you must refer to the detector's user manual; for example, a lit yellow LED can correspond to a level of 0.27 to 0.34 V/m in a high-frequency electric field.
What is an electromagnetic wave measuring device?
A wave measuring device is an instrument with an LCD screen that accurately displays the measured value in digits of the measured electromagnetic field strength in a given unit that depends on the type of electromagnetic wave (low-frequency electric field, low-frequency magnetic field, or high-frequency electric field).
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What are the differences between the ESI22, ESI23 and ESI24 wave detectors? Which one to choose?
| Detector/wave type | Low frequencies | High frequencies |
|---|---|---|
| ESI 22 | Yes | Non |
| ESI 23 | Yes | Yes (50 MHz to 6 GHz) |
| 24 | Yes | Yes (50 MHz to 10 GHz) |
These three detectors evaluate both the electric field and the magnetic field at low frequencies on separate LED lines. Frequency range detected at low frequencies: 16 Hz to 3 kHz.
They all have the function of checking the direction of connection of your electrical devices (bedside lamps, etc.). An electrical device without an earth connection often generates an electric field even when it is switched off, if the plug is plugged in the wrong way. These detectors allow you to check the direction of connection and thus reduce your exposure to low-frequency electromagnetic waves.
The ESI 23 and ESI 24 detectors are described as versatile because they detect both low-frequency and high-frequency electromagnetic waves (5G, Wifi, etc.).
The ESI 22 detector is particularly recommended in the event of an electromagnetic anomaly linked to electricity (HT power line, electrified railway, electrical transformer, etc.) or in a non-urban environment where high-frequency waves (WiFi, mobile telephony, etc.) are much less present than in an urban environment, the main source of electromagnetic pollution being electricity in general and domestic electricity in particular.
The ESI24 wave detector has additional features compared to the ESI23 (for more information, see the product sheets).
ESI22 Detector - direct link to the product sheet
ESI23 Detector - direct link to the product sheet
ESI24 Detector - direct link to the product sheet
New devices complete this range of detectors:
- Cemprotec 31 wave detector (high frequency electromagnetic waves)
- Cemprotec 33 wave detector (low and high frequency electromagnetic waves)
- Cemprotec 34 wave detector (low and high frequency electromagnetic waves)
These three devices have additional features and extended measuring ranges compared to the ESI detector range.
The ESI 21 electromagnetic wave detector has been replaced by the Cemprotec 31 wave detector.
The ESI 23 electromagnetic wave detector has been replaced by the Cemprotec 33 wave detector.
The ESI 24 electromagnetic wave detector has been replaced by the Cemprotec 34 wave detector.
Which electromagnetic wave detector to choose? (article from our blog)
Cemprotec31 detector - direct link to the product sheet
Cemprotec33 detector - direct link to the product sheet
Cemprotec34 detector - direct link to the product sheet
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| Devices/Features | Measured frequency range | Frequency filter | Food | Price |
|---|---|---|---|---|
| ME3030B | 16 Hz - 2 kHz | Non | 9V battery | € |
| ME3830B | 16 Hz - 100 kHz | Non | 9V battery | €€ |
| ME3840B | 5 Hz - 100 kHz | Yes | 9V battery | €€ |
| ME3851A | 5 Hz - 100 kHz | Yes | NiMH battery | €€€ |
| ME3951A | 5 Hz - 400 kHz | Yes | NiMH battery | €€€ |
The adjustable frequency filter integrated on the ME3840B, ME3851A and ME3951A devices allows to measure an electric field intensity or a magnetic field at a given frequency.
The ME3030B, ME3830B and ME3840B wave measuring devices are particularly dedicated to individuals and semi-professionals.
The ME3851A and ME3951A wave measuring instruments are mainly intended for professionals in electromagnetic wave measurement due to their advanced features, wide measurable frequency range and high sensitivity.
The detailed functionalities of each of these low-frequency electromagnetic wave measuring devices are given on their respective product sheets.
All these low-frequency electromagnetic wave measuring devices measure the electric field and the low-frequency magnetic field, switching from one to the other via a switch located on the right of the device.
ME3030B measuring device - direct link to the product sheet
ME3830B measuring device - direct link to the product sheet
ME3840B measuring device - direct link to the product sheet
ME3851A measuring device - direct link to the product sheet
ME3951A measuring device - direct link to the product sheet
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Which Gigahertz Solutions or TES brand high-frequency electromagnetic wave measuring device should I choose?
TES brand electromagnetic wave measuring devices: TES-92 and TES-593
Gigahertz Solutions brand wave measuring devices: HF32D, HF35C, HFW35C, HF38B, HFE35C and HF59B
How to measure 5G waves? (article from our blog)
| Device/Function | Measured frequency range | Acoustic analysis | Unit of measurement | Price |
|---|---|---|---|---|
| TES-92 | 50 MHz - 3,5 GHz | Non | V/m et µW/m2 | € |
| TES-593 | 10 MHz - 8 GHz | Non | V/m et µW/m2 | €€€ |
| HF32D | 800 MHz - 2,7 GHz | Non | µW/m2 | €€ |
| HF35C | 800 MHz - 2,7 GHz | Yes | µW/m2 | €€€ |
| HFW35C | 2,4 GHz - 6 GHz | Yes | µW/m2 | €€€ |
| HF38B | 700 MHz - 3,3 GHz | Yes | µW/m2 | €€€ |
| HFE35C | 27 MHz - 2,7 GHz | Yes | µW/m2 | €€€€ |
| HF59B | 700 MHz - 3,3 GHz | Yes | µW/m2 | €€€€ |
Acoustic analysis: acoustic analysis function (detailed listening to the characteristic modulations of different high frequency sources) with adjustable volume.
All these measuring devices are powered by a 9V alkaline battery except the HF59B which has a NiMH battery with charger supplied and the TES-593 which has a Li-ion battery with charger also supplied.
With its advanced features and high sensitivity, the HF59B device is dedicated to professionals in electromagnetic wave measurement.
The HFE35C and HF59B electromagnetic wave meters can be optionally equipped with a frequency filter (FF10 from Gigahertz Solutions). This FF10 filter allows you to measure a high-frequency electric field intensity at a given frequency (for example, measuring just WiFi radiation or just the intensity of 4G at a specific frequency).
The detailed functionalities of each of these high-frequency electromagnetic wave measuring devices are given on their respective product sheets.
The Tenmars brand also offers instruments for measuring high-frequency electromagnetic waves:
- the TM-195 (equivalent to the TES-92)
- the TM-196 (equivalent to the TES-593)
The features are basically the same, the measured frequency ranges are identical, only the design changes. The TM-195 and TM-196 are powered by 9V alkaline batteries.
Gigahertz Solutions high-frequency wave measuring instruments are highly sensitive and can detect very small electromagnetic radiation anomalies. They have measurement limits of 0.868 V/m or 2.746 V/m. To measure higher high-frequency electromagnetic wave intensities, complete the purchase of these wave measuring devices with a DG20 or DG20_G10 attenuator. These attenuators can measure wave intensities up to 8.683 V/m or 27.459 V/m.
The DG20 attenuator works with the following Gigahertz Solutions wave measuring instruments: HF32D, HF35C and HF38B.
Direct link to the product sheet
The DG20_G10 attenuator works with the following Gigahertz Solutions wave measuring instruments: HFE35C, HFW35C, HF59B, HFE59B and HFW59B.
Direct link to the product sheet
TES92 measuring device - direct link to the product sheet
TM195 measuring device - direct link to the product sheet
TES593 measuring device - direct link to the product sheet
TM196 measuring device - direct link to the product sheet
HF32D measuring device - direct link to the product sheet
HF35C measuring device - direct link to the product sheet
HFW35C measuring device - direct link to the product sheet
HF38B measuring device - direct link to the product sheet
HFE35C measuring device - direct link to the product sheet
HF59B measuring device - direct link to the product sheet
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Which anti-Linky CPL filter should I choose and how do they work?
The Polier Prostop65 and Panda anti-Linky CPL filters have been designed to stop dirty electricity and prevent it from circulating on the electrical network of your home. Dirty electricity generates a low-frequency electromagnetic field through the electrical network of an apartment or house that is different from that of the 50-60 Hz electric current and which is added to it.
The sources of electromagnetic pollution are diverse and varied (communicating "Linky" electricity meter, photovoltaic solar panels, energy-saving compact fluorescent bulbs, electrical transformers, etc.).
Pollution can come from your home but also from your neighbors. It is possible to filter electricity and remove dirty electricity, a source of electromagnetic pollution. For this, there are two different types of CPL filters: series filters (Polier Prostop65) and parallel filters (Polier Panda).
Depending on the origin of the electromagnetic pollution, the most suitable CPL filter will need to be installed. It is possible to install both types of CPL filters in the same home.
The Polier Prostop65 anti-Linky CPL filter is a "series" type filter, its operating principle is that it filters the electrical signal coming from outside your home to block all dirty electricity ("Linky" meter, electrical transformers, etc.). It is installed between your electricity meter and the electrical panel of your home by a professional electrician.
The Polier Panda anti-Linky CPL filter is a "parallel" type filter, it filters the electrical signal close to the source of pollution. It particularly targets dirty electricity inside your apartment or house.
Polier Prostop65 CPL filter (direct link to the product sheet)
Polier Panda CPL filter (direct link to the product sheet)
More information in this article from our blog (click on the link):
Polier Prostop65 and Panda CPL filters to stop dirty electricity on your home electrical network.
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Which anti-electromagnetic wave paint should you choose?
The Diagnostic CEM online store offers you the entire range of low-frequency (electric field of electric current) and high-frequency (5G, WiFi, etc.) anti-electromagnetic wave paints from the German brand YShield.
Direct link to the category in the store
YShield anti-EMF paints do not contain graphene. They also do not contain nanotechnologies or nanomaterials.
YShield anti-wave paints are available in 5-litre pots or 1-litre cans. The average coverage is 1 litre for 6 m2. They can be applied in several layers.
The different characteristics of YShield anti-electromagnetic wave paints are as follows:
| Anti-wave paint | Main protection | Attenuation (*) | Observations |
|---|---|---|---|
| NSF34 | BF electric field | 80 dB (**) | BF: Low Frequency. Grounding required |
| MAX54 | High frequencies | 40 dB | Maximum attenuation, grounding required |
| HSF54 | High frequencies | 39 dB | Very good adhesion, grounding required |
| PRO54 | High frequencies | 36 dB | Ease of implementation, grounding required |
| HFS64 | High frequencies | 36 dB | Ecological, grounding required |
(*) : attenuation provided in only one layer, for high frequencies attenuation at 1 GHz, for other frequencies, refer to the product sheet in the store.
(**): depends on the quality of the resistance of the earth connection of the accommodation.
The higher the attenuation in decibels (dB), the less the anti-wave paint lets electromagnetic waves through. An attenuation of around thirty dB hardly lets any waves through at all. An attenuation of 30 dB corresponds to a reduction in the intensity of the electromagnetic field of 99.9%. An attenuation of 40 dB corresponds to a reduction in the intensity of the electromagnetic field of 99.99%.
YShield NSF34 anti-wave paint - Direct link to the product sheet
YShield MAX54 anti-wave paint - Direct link to the product sheet
YShield HSF54 anti-wave paint - Direct link to the product sheet
YShield PRO54 anti-wave paint - Direct link to the product sheet
YShield HSF64 anti-wave paint - Direct link to the product sheet
Which anti-electromagnetic wave protective paint should you choose? (article from our blog)
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Which anti-high frequency electromagnetic wave film for windows should you choose?
The Diagnostic CEM online store offers you the entire range of high-frequency anti-electromagnetic wave films (5G, WiFi, etc.) from the German brand YShield.
Direct link to the category in the store
YShield anti-wave films for glass surfaces are available in two sizes: width 76 cm and width 152 cm. The higher the attenuation in decibels (dB), the less the anti-wave film lets electromagnetic waves through. An attenuation of around thirty dB hardly lets any waves through at all. An attenuation of 18 dB corresponds to a reduction in the intensity of the electromagnetic field of around 98%. An attenuation of 33 dB corresponds to a reduction in the intensity of the electromagnetic field of around 99.9%.
The various characteristics of YShield high-frequency anti-electromagnetic wave window films are as follows:
| Anti-wave film | Protection | Mitigation | Light transmission | Remarks |
|---|---|---|---|---|
| RDF62 | High frequencies | 18 dB | 62% | Accessories: FMK30 concentrated solution and FVR10 application squeegee |
| RDF72 | High frequencies | 33 dB | 72% | Accessories: FMK30 concentrated solution and FVR10 application squeegee, FL4 sealing joint |
| RDF25 | High frequencies | 35 dB | 25% | Accessories: FMK30 concentrated solution and FVR10 application squeegee, FL4 sealing joint |
For RDF62 and RDF72 anti-wave films: use only indoors and only on non-thermally insulated glazing.
For the RDF25 film:
- outdoor use: RDF25 film can be applied outdoors on thermally insulated glazing.
- indoor use: only on non-thermally insulated glazing.
HF anti-wave film for windows RDF62 - Direct link to the product sheet
HF anti-wave film for windows RDF72 - Direct link to the product sheet
HF anti-wave film for windows RDF25 - Direct link to the product sheet
Which anti-high-frequency electromagnetic wave film for windows should you choose? (article from our blog)
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How to choose the right protection against electromagnetic waves?
What effective anti-wave protection should you choose? Anti-wave paint, anti-wave fabrics, anti-wave wall coverings, etc.?
What electromagnetic field do they protect against? How to protect yourself from 5G, Wifi, CPL Linky?
The table below presents a presentation of the various truly effective anti-electromagnetic wave protection solutions and their possible uses for blocking electromagnetic pollution from various sources.
Low-frequency (LF) electromagnetic waves come from electric current (high-voltage power lines, electrical transformers, electrical appliances, electrical panels and electric meters, domestic electricity, etc.).
High-frequency (HF) electromagnetic waves are linked to WiFi, Bluetooth, mobile telephony (3G, 4G, 5G relay antennas), radio and television broadcasting, DECT-type cordless domestic telephones, radars, etc.
How to protect yourself from 5G waves? (article from our blog)
Legend of the terms in the table below:
HF: high frequency electromagnetic waves (3G, 4G, 5G, Wifi, DECT, Bluetooth, FM, RNT, TNT,...)
BF: low frequency electromagnetic waves (electric current)
CE: electric field (low frequency)
CM: magnetic field (low frequency)
Dirty electricity: CPL Linky, etc.
| Type of anti-wave protection | Protection provided | Uses, observations |
|---|---|---|
| CPL anti-Lines filters Prostop65 | dirty electricity on the domestic power grid | To be installed on the electrical panel. |
| CPL anti-Lines Panda filters | dirty electricity on the domestic power grid | To be plugged into an electrical outlet. |
| Bioswitch (IAC) | CE BF and CM BF of the domestic electrical network | To be installed on the electrical panel. Electrical circuit of the rooms,... |
| Danell shielded power strips | CE BF and CM BF of electrical devices | Double pole switch and shielded cable |
| NSF34 anti-wave paint | CE BF | Walls, floors, ceilings. Interior and exterior. Grounding required. |
| HSF64 anti-wave paint | HF and CE BF | Walls, floors, ceilings indoors only. Grounding required. Eco-friendly paint. |
| MAX54, PRO54 and HSF54 anti-wave paints | HF and CE BF | Walls, floors, ceilings. Interior and exterior. Grounding required. |
| YShield anti-wave fabrics | HF and CE BF if grounded | Curtains, net curtains, bed canopies, clothing. Grounding required if CE BF protection desired. |
| Swiss Shield anti-wave fabrics | HF | Curtains, net curtains, bed canopies, clothing. |
| YShield anti-wave wall coverings | HF and CE BF | Walls, floors, ceilings. Freestanding or glued installation. Grounding required. |
| YShield anti-wave wallpapers | HF and CE BF | Walls and ceilings. Grounding required. |
| YShield anti-wave canopies | HF and CE BF if grounded | For single or double beds. Grounding required if CE BF protection required. Option: anti-wave floor mat. |
| Swiss Shield fabric anti-wave canopies | HF | For single or double beds. Option: anti-wave floor mat. |
| RDF62 and RDF72 anti-wave window films | HF | Windows, French windows, flat glass surfaces indoors only. On non-thermally insulated glazing. |
| RDF25 anti-wave window films | HF | Outdoors, on all types of glazing. Indoors, only on non-thermally insulated glazing. |
| Grounding USB Cable | CE BF of electrical devices without earth | Internet box, television, laptop,... |
| Anti-wave fabric covers for internet boxes | HF | Wifi waves emitted by internet boxes even when Wifi is disabled |
HF: high frequency electromagnetic waves (3G, 4G, 5G, Wifi, DECT, Bluetooth, FM, RNT, TNT,...)
BF: low frequency electromagnetic waves (electric current)
CE: electric field (low frequency)
CM: magnetic field (low frequency)
More information on anti-Linky CPL filters in our blog
More information about bioswitches in our blog
More information about anti-wave paints in our blog
More information about anti-wave wallpapers in our blog
More information about anti-wave fabrics in our blog
More information about anti-wave films for windows in our blog
Polier Panda CPL filter - direct link to the product sheet
Polier Prostop65 CPL filter - direct link to the product sheet
The NA7 Comfort Gigahertz Solutions bioswitch (or IAC) - direct link to the product sheet
Danell shielded electrical power strips - direct link to the product sheet
The grounding USB cable - direct link to the product sheet
Covers for internet boxes - direct link to the product sheet
Anti-electromagnetic wave paints - direct link to the category in the shop
Anti-electromagnetic wave fabrics - direct link to the category in the shop
Anti-electromagnetic wave wall coverings - direct link to the category in the shop
Anti-electromagnetic wave wallpapers - direct link to the category in the shop
Anti-electromagnetic wave window films - direct link to the category in the shop
Anti-electromagnetic wave canopies - direct link to the category in the shop
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Correspondence between attenuation in dB (decibel) and reduction in %:
The table below gives you the correspondences of the theoretical attenuation levels:
| Attenuation in dB | Dividing the signal power by | % reduction of the electromagnetic field |
|---|---|---|
| 10 dB | 10 | 90 % |
| 20 dB | 100 | 99 % |
| 30 dB | 1000 | 99,9 % |
| 40 dB | 10 000 | 99,99 % |
The table above shows the theoretical attenuations to characterize the protection and shielding materials and their effectiveness on electromagnetic fields. It is necessary to take the greatest care in the implementation of the materials for protection against electromagnetic waves in order to minimize leaks in the shielding and unprotected parts. We advise you to call on a professional in wave protection.
The higher the attenuation indicated in dB in the product sheet, the more the product protects against electromagnetic waves.
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