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Combination Meters

Trifield Flat Frequency Meter

Ex100 Version

Trifield Meter The TriField Meter is the most economical combination of magnetic, electric, and analog radio/microwave detection in one package. This meter combines all these unique features with fast, reliable measurements of electromagnetic pollution:

Continuous sampling needle gauge readout;
3-axis magnetic sensitivity;
Two separate scales for magnetic field readings;
Hand-held portability and simplicity.

The TriField Meter will accurately measure EMF pollution from these "hot spots" in your home, office, or work environment so you can take steps for "prudent avoidance":

  • poorly grounded wiring
  • microwave oven doors
  • dimmer switches
  • strong analog RF transmitters
  • automobiles
  • TV's & computers
  • other electronic equipment

Frequency Range
Magnetic 1:
1 mG
0-100 mG
± 20%
50 Hz - 100 kHz
Magnetic 2:
0.2 mG
0-3 mG
± 20%
50 Hz - 100 kHz
5 V/m
0-1000 V/m
± 30%
50 Hz - 100 kHz
0.01 mW/cm²
0-1 mW/cm²
Factor of 2
at 2 GHz
50 MHz - 3 GHz
What is unique about this meter? Lowest cost 3-axis meter, lightning fast response needle gauge, 3 meters in one

Have peace of mind and confidence in knowing where this body penetrating pollution is coming from, and how powerful it is, so you can protect yourself and loved ones. Instruction booklet and 9V battery included. RF capability is not for digital signals. One year limited warranty. Made in U.S.A.

Made in USA Trifield Flat Frequency Response Meter (Cat. # A150-F).....$149.95 add to cart

TRIFIELD™ METER: Frequency Weighted

This modified version of the Trifield Flat Meter has all the same specifications with this one important difference: magnetic field response is frequency weighted. Frequency weighting gives a better indication of the biological impact of the field. It is important to note that readout is frequency weighted from 30 to 500 Hz, and calibrated at 50 or 60 Hz. What this means is that a 2 mG magnetic field at 60 Hz will read "2" on the meter, but 2 mG at 120 Hz will read "4". From 500 Hz to 1000 Hz, the response is flat ±20%. Above 1000Hz, sensitivity decreases with increasing frequency.

Click to read more about TriField Flat verses Weighted Frequency Response (.pdf).

Made in USA TRIFIELD METER 60 Hz calibration (Cat. #A150-60).....$149.95 add to cart
TRIFIELD METER 50 Hz calibration (Cat. #A150-50).....$149.95 add to cart

Specify 50 or 60 Hz calibration when ordering

Trifield Extended Range Meter

Trifield "Extended Range, Broadband" Meter

This modified version of the frequency weighted Trifield Meter has the following advantages:

• The magnetic field sensor has enhanced sensitivity to frequencies below 50Hz
(for example, sensitivity at 5 Hz is 33 times greater than the regular Trifield meter)

• The RF sensor is frequency-flat over the extended range of 100 kHz - 2.5 GHz.
This fills the gap of 100 kHz - 50 MHz missed by the regular Trifield meter
(However sensitivity is shifted to a range of 0.026 - 260 mW/cm²)

Frequency Range
Magnetic 1:
1 mG
0-100 mG
± 20%
5 Hz - 100 kHz
Magnetic 2:
0.2 mG
0-3 mG
± 20%
5 Hz - 100 kHz
10 V/m
0-1000 V/m
± 30%
5 Hz - 100 kHz
0.01 kV/m
0-1 kV/m
Factor of 2
at 2 GHz
100 kHz - 2.5 GHz
What is unique about this meter? Useful for ELF frequencies below 50 Hz, and RF below 50 MHz, good for very strong RF signals

With these extended ranges, you can detect slow moving static electric and magnetic fields, concealed analog RF transmitters, very weak AC electric fields from wall switches and concealed wiring, and lots of other low frequency EMF sources you might have missed, as well as fine tuning your shielding efforts!

Made in USA Trifield Extended Range Broadband Meter (Cat. #A155)........$189.95 add to cart

MAG-TEMP Mel-8704R

Simultaneous EMF and Temperature Readout with Illuminated RED Display Mag-Temp

When you need to measure EMF and temperature, you need one hand operation that gives you a wealth of information, and lots of options.

Mag-Temp offers both single axis AC Magnetic field measurement and real time air temperature readings. Display illumination is RED, so it doesn’t saturate your eyes when working in in dark areas. Red flashlight is built-in. Readout in mG or µT, °F or °C. High resolution and fast response. Basic 1 inch K-Type thermocouple is included and it can be used with a variety of commercially available thermocouple probes for extended temperature ranges. Solves the age old equipment problem of "How do I hold all this stuff?"! DAS Logo

Additional features:

  • Max/Min/Hold
  • EMF Bandwidth: 30-300 Hz
  • 3 EMF Ranges: 200 mG (0.1 mG resolution), 2000 mG, 20,000 mG
  • Temp: -40 to 482 °F (0.1° resolution)
  • Backlight can be on or off
  • 9V battery powered, or AC to 9V adapter (not included)
What is unique about this meter? magnetic and temperature in one meter, good for very strong fields, backlite

Mag-Temp Meter (Cat. #A105R) ............... $109.90 add to cart


Detects & Displays All 3 EMF Types at Once

The very unique ESI 24 checks for all 3 types of EMF: magnetic fields, electric fields, and radiowaves/microwaves simultaneously. Easy to interpret RED / YELLOW / GREEN LED lights indicate EMF level and are supported by a loudspeaker that gives an audible indication of field strengths. Sound frequency/intensity changes with increasing field strengths. Sound can be turned off if you prefer. Allows for quick and easy localization of the sources of different types of EMF. The display shows 5 different levels, ranging from extremely low (i.e. no significant radiation exposure) to too strong for prolonged exposure and distinguishes how much for each radiation type. Super easy and super sensitive.

Frequency RangeAxis
Magnetic field:16Hz – 3kHz3
Electric Field:16Hz – 3kHz1
Radiowaves:50MHz – 8GHz3
Includes Enhanced RF Mode in which only RF is measured using all 15 LEDs. Gives greater range and greater resolution. Sources detected by ESI 24: cell phone towers, cordless phones, wireless LAN, Wi-Fi systems, power lines, electrical installations and appliances, baby monitors and alarms, microwave ovens, cell phones, etc.

Magnetic field (nT)<2080-120160-200300-400>1000
Electric Field (V/m)<615-2025-3035-40>50
Radiowaves (µW/m²)
2 – 3900 depending on frequency
RF Enhanced Mode (µW/m²)
.06 – 5900 depending on frequency

Operates for about 10 hours on one 9V battery (included). 2 year warranty.

ESI 24 EMF Monitor (Cat. #A498) .................................. $329.95 add to cart


RF/Gauss Field Meter Detect Both EMF Hazards for One Low Price

Want measure both AC magnetic field and radiofrequency (microwave) radiation? Need more information than just LEDs or sound? Working on a limited budget? This unit is the first to combine these capabilities with a digital readout at low cost!

RF valid for both analog (microwave oven, AM/FM) and digital (GSM, TDMA, CDMA, PCS, Wi-Fi) signals and can distinguish between them. So easy to use, just choose RF or Magnetic, then point and read! Even includes a HOLD button to freeze the meter reading. Magnetic sensor is 1 axis, and RF is directional.

    Display screen includes:
  • RF Signal displayed as mW/m², V/m, or dBm
  • Both mG and µT Magnetic Field units display simultaneously
  • Horizontal bar “power level display” with 12 5dBm segments
  • Moving bargraph (histogram) showing signal changes over the last 30 readings
  • 8 segment LED bar (green/yellow/red) with corresponding power indication
  • Backlite which can be turned on/off

RF modeGauss meter mode, 2 ranges
Frequency range:100 MHz to 8.0 GHz50 Hz to 10 KHz useful range
Sensitivity:0.5 µW/m² to 1.8 W/m²0.1 to 10 mG1 to 600 mG
What is unique about this meter? magnetic and RF in one meter, digital readout, high sensitivity

Check your cell phones, computers, wiring, powerlines and just about any electrical/electronic device.
Requires one 9V battery. Model ED-78s.

RF/Gauss Field Meter (Cat. #A439s) ...... $139.95 add to cart

8 Intensity Level Increments
On the LED bar display
-5 dBm = 180 mW/m²30+ microT 
-10 dBm = 58 mW/m²20 microT 
-15 dBm = 18 mW/m²10 microT 
-20 dBm = 5.8 mW/m²5 microT 
-25 dBm = 1.8 mW/m²2 microT 
-30 dBm = 0.58 mW/m²0.5 microT 
-35 dBm = 0.18 mW/m²0.2 microT 
-40 dBm = 0.06 mW/m²<0.2 microT 

Digital Combination Meter


1-Axis Electric and Magnetic Field measurements

The Digital Combination Meter boasts several distinct advantages for a meter in this price range:

  • Wide frequency response: very flat (1 dB) from 16 Hz to 2000 Hz; useful from 5 Hz to 7000 Hz (3 dB)
  • Tremendous Sensitivity and Range:
    - Magnetic: 1-2000 nT (0.01-20.00 mG);
    - Electric: 1-2000 V/m
  • Accuracy: ±2% ±20 digits at 50/60 Hz
  • Cool audio tone which resembles a Geiger counter
  • Simple to operate, easy to read.

YouTube video demonstrating this meter:
Electric Field
Magnetic Field
Frequency range:16 - 2000 Hz (1 dB); 5 Hz to 7000 Hz (3 dB)
Range:1-2000 V/m1-2000 nT (0.01-20.00 mG)
Sensitivity:1 V/m1 nT (0.01 mG)
Accuracy±2% ±20 digits at 50/60 Hz
What is unique about this meter? digital readout E & M, high accuracy & sensitivity, sound

Perfect for home, student, or researcher.
Uses a standard 9V battery, included. Instructions in German and English. 2 year warranty. Model ME3030B.

Digital Combination Meter (Cat. #A480) …… $189.00 add to cart


Professional Combination Meter

Professional Quality and Versatility

This meters meets all TCO requirements for AC Electric and Magnetic Field measurements. Tremendous sensitivity and highly linear over 4 selectable frequency ranges which allows for determination of ELF compared to VLF readings, ultra-low frequencies down to 5 Hz, and a special filter for 16 Hz typically associated with electric trains. Includes both an AC voltage output (to analyze frequency information or use a headset to hear the corresponding audio frequencies) and a DC output (for long term monitoring with a recording device), Geiger counter style audio output, auto power off, and integrated battery check.

Single axis
3½ digit LCD display. Power consumption: 15-20 mA.
Includes 8 hour rechargeable 9V battery, AC power supply/charger, and ground cord.
Manual in English and German. 2 year warranty. Model ME3851A.

AC Magnetic
AC Electric
Range 1:
0-200 nT (2 mG)
0-200 V/m
Resolution 1:
0.1 nT (0.001 mG)
0.1 V/m
Range 2:
0-2000 nT (20 mG)
0-2000 V/m
Resolution 2:
1 nT (0.01 mG)
1 V/m
What is unique about this meter?
digital readout E & M, extremely high accuracy & sensitivity, toggle frequency range, AC/DC voltage output, sound

    Frequency range choices:
  • 5 Hz – 100 kHz (full bandwidth)
  • 16 Hz (electric trains)
  • 50 Hz – 100 kHz (ELF + VLF)
  • 2 kHz – 100 kHz (VLF only)

Professional Combination Meter (Cat. #A482) ........................ $595.00 add to cart

DC/AC Gaussmeter

Magnetic Field Strength with Frequency, DC -1 kHz DC/AC Gaussmeter

So what magnetic fields do you want to measaure? AC? DC? Need frequency information too? This meter does all that and more. Simlutaneous digital readout of field strength and predominate frequency, true RMS measurement with peak hold, One volt full scale analog voltage output, alarm, dataloging up to 32,000 data points, and 3 % error guarantee. External probe.

Operate in 1 of 3 modes:
3 Ranges:
DC only300 G (100 mG resolution)
AC only: 20 Hz - 1 kHz3 kG (1 G resolution)
AC + DC: 0 – 1 kHz30 kG (10 G resolution)

Completely portable. 4 AA alkaline batteries included and optional 6V DC adaptor available. Choose axial probe, transverse probe, or both. Zero gauss chamber (sold seperately) helps when zero-ing the unit.

Made in USA DC/AC Gaussmeter Axial Probe (Cat. #A1132-A)…………............. $1195.00 add to cart
DC/AC Gaussmeter Trans Probe (Cat. #A1132-T)…………............ $1195.00 add to cart
DC/AC Gaussmeter Both A&T Probes (Cat. #A1132-AT)………… $1445.00 add to cart

Bonus: For a limited time, order the DC/AC Gaussmeter and get a free 4 inch (0.5 inch ID) Mini Zero Gauss Chamber.
Click here to add this item: Free Mini Zero Gauss Chamber add to cart

Zero Gauss Chamber

Zero Gauss Chamber

This chamber can be used with the DC/AC Gaussmeter to provide a zero gauss (magnetic field-free environment) reference, enabling you to take absolute readings of the ambient magnetic field (the Earth's magnetic field is typically around 500 mG). Concentric welded 12" long tubes (1" ID chamber) with stand, made of high permeability magnetic shielding alloy provide excellent shielding.

Made in USA Zero Gauss Chamber (Cat. #A3105) ......... $350.00 add to cart


Peace of Mind for Pacemaker Wearers


Pacemakers and implantable defibrillators are vulnerable to strong electromagnetic fields. Manufacturers of these devices have set EMF exposure limits, but how is the user to know if his work or home environment is safe?

PaceAlert is the first and only meter/alarm designed specifically with pacemaker safety in mind. Simply turn the unit on and it will warn with LED lights and audible alarm if it encounters EMF near the limits for proper and safe operation of implanted devices. PaceAlert monitors AC magnetic fields, AC electric fields, and radiofrequencies simultaneously. Common sources of strong fields include microwave ovens, power tools, hair dryers, vacuum cleaners, electric ranges and toaster ovens, electric circuit boxes, welding equipment, etc.

    Alarm thresholds:
  • 4 kV/m for electric field at 50/60 Hz
  • 1.5 Gauss magnetic field at 50/60 Hz
  • 100 V/m RF from 500 kHz – 6 GHz
no Pacemakers

No adjustments needed, no complicated interpretations to make. If you hear the alarm, you are too close! LEDs will indicate type of EMF (electric, magnetic, or RF). Convenient size fits in pocket or purse. Or it can be worn as a necklace or on belt clip. Gets about 20 hours on standard 9V alkaline battery, 9 hours with rechargeable. Low battery indicator. One year warranty. Annual re-calibration available.

PaceAlert (Cat. #A475) ............... $199.95 add to cart

In The News:

A research team at the Academic Medical Center at the University of Amsterdam examined the effects of GPRS and UMTS signals on critical care equipment such as ventilators and pacemakers. There were almost fifty incidents of EMI impacting the devices, and 75 percent of these could be characterized as significant or hazardous. Problems observed - a total switch off and restart of mechanical ventilators, complete cessation with no alarm sounded of syringe pumps, and incorrect pulsing of an internal pacemaker. Second-generation phones based on GPRS technology generated the most serious instances of EMI—sometimes from as far away as three meters. Read more


Attention all pacemaker wearers!
Attention all paranormal researchers!
Attention electrical sensitives!

Personal EMF Alarm What could be better than a meter which alerts you with a loud audible alarm when it encounters a field? How about a meter which allows you to set the sensitivity of the alarm? How about a 3 axis meter? How about a meter which does all this for AC magnetic fields, AC electric fields, and RF radiation?! This meter does all that, for under $200!!

We are very excited to offer this simple and useful item for anyone who wants to monitor their EMF environment without having to stare at their meter for hour after hour. Carry it with you to alert you when you become exposed to more radiation that you want. Set it in a strategic location to alert you when a field trips the alarm. You set the level (threshold) above which the alarm will sound. Can also be used as a nice analog meter to read field strength. Same specifications as our Trifield Meter.

Made in USA Personal EMF Alarm (Cat. #A154) …… $189.95 add to cart



EMF Meter, Microwave & Temperature in One!

Versatile new meter for detecting cell phone radiation, power line EMF, as well as paranormal research. Combines AC magnetic field detection, microwave sensor, and temperature in a very compact design. Easy to read LED indication and dramatic sound.

For cell phones, microwave ovens, and other high frequency appliances:
500 kHz to 2.4 GHz
0.01 to 0.30 mW/cm² in 10 color-coded increments:
- Green light (safe): Less than 0.02 mW/cm²
- Yellow light (caution): 0.02 to 0.1 mW/cm²
- Red light (warning): higher than 0.1 mW/cm²

For power lines, TVs, computers, AC alarm clocks, motors and other electric appliances:
30 Hz to 5 kHz
1 to 10 mG in 10 color-coded increments:
- Green light (safe): Less than 2.5 mG
- Yellow light (caution): 2.5 to 8 mG
- Red light (warning): higher than 8 mG

Temperature: External temperature probe on 6 foot cable (sold separately).
32 – 102°F (0-40°C) in 5 increments. Audible warning at 99°F

Power: 9V battery (not included) good for continuous use for more than 30 hours. One-year warranty. Very unique!

What is unique about this meter? magnetic field and temperature in very simple format

EMF Hunter (meter only) (Cat. #A473) ……… $79.95 add to cart

Temperature Probe (Cat. #A473-T) ................... $10.00 add to cart

Deluxe Instrument Case


Perfect for instruments or cameras. Fits plenty of stuff in a compact space. This rugged case features aluminum trim, triple riveted corners, carry handle and locking metal clamp hinges. Black hard sidewalls. Padded inside walls but no foam. 12'' x 10'' x 4''.
Deluxe Instrument Case (Cat. #A711) …… $18.95
add to cart

Can't decide which meter is right for you?
Click here to go to the handy Meter Selection Guide.

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