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The EPA recommends prudent avoidance of EMFs - Make sure your home is safe!

 
Products

USB-RAD121 Geiger Counter

Lowcost USB Geiger Counter!

Overview

Geiger Counter

The USB-RAD121 is a radiation detector that runs completely off your computer's USB port.  The device features a classic geiger counter click and light pulse for every count registered, while radiation levels are displayed on the computer.  The simple RadGraph software interface displays and graphs readings over time, and even allows the readings to be streamed to a personal webpage.

Make sure your home or office is safe from radiation by monitoring it with the USB-RAD121 geiger counter!


RadGraph Screenshot:

RadGraph Screenshot


Specifications

Specifications

  • Accuracy: ±10% Typical, ±15% Max (Co60)
  • Measures: BETA and GAMMA Radiation
  • Uses a high-quality American-made geiger tube
  • Range 0-50 mR/hr
  • Anti-Saturation: 500 mR/hr Minimum
  • Sensitivity: 450 cpm/mR/hr, dead-time compensated
  • Unit of Measurement: mR/hr, μR/hr, μSv/hr, CPM (compensated or uncompensated)
  • LED Flashes with each count
  • Buzzer beeps with each count (can be disabled in software)
  • Detector Window: 30 mg/cm2 x .002” thick
  • Interface: Computer, USB Type B (Cable Included)
  • Power: Port-Powered from USB Port
  • Unit Weight (without cable): 1.6 oz
  • Unit Dimensions: 4.00" x 1.25" x 1.00"
  • Connects to PC with USB Type A to Type B Cable (included)
  • Software Interface: RadGraph or RadMeter (both free downloads)
  • 2 Year Warranty
  • Made in the USA
  • HS Tariff Number for International Orders: 9030.10.00

Note: The USB-RAD121 is a calibrated geiger counter, designed for general purpose use and should not be used in safety-critical applications.

Code Examples

Yes, we even provide you with a C++ code example and class for reading the USB-RAD121 geiger counter!  The class allows you to connect to the device, take readings, convert your readings to mR/hr, and enable/disable the sound on the device.  The library provided runs on Windows, but it is possible to get the code to run on MacOS X or Linux as well.

#include <time.h>
#include "CUSB_RAD121.h"

void main()
{
    CUSB_RAD121 counter;
    double cpm, mR_hr;

    counter.Open();                                 // Connect to the device
    Sleep( 30000 );                                 // Give the unit 30 seconds to gather counts
    counter.GetReading( &cpm );                     // Get the counts per minute from the device
    mR_hr = CUSB_RAD121::Calculate_mRhr( cpm );     // Convert cpm to mR/hr
    counter.Close();                                // Disconnect from the device
}

Download the Visual Studio C++ example project, with the class source code here:

Visual Studio C++ Code Example (Example Date: May 4, 2013)

Reviews

Product Reviews

"Very good quality device with all the attributes of modern technology.

I got the USB-RAD121. Everything was delivered in complete order and at the first touch you feel professionally designed and assembled unit.  Installation of device driver and software to 64-bit Windows 7 was easy and straightforward. GUI interface is quite complex, but has no perception of the screen cluttered with many symbols, buttons and windows." - Alexandre, Cambridge, New Zealand



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$ 219.00


 

Contacta Loop-TSG

Designed for hearing aid loop calibration

Overview


LOOP-TSG Signal Generator

Audio signal generator that can be used with the Loop-FSM to calibrate audio frequency induction loop (AFIL) systems.  This device is designed and manufactured by Magnii Technologies for Contacta, Inc.

  • Simple 1-Button Operation
  • Balanced XLR Output Jack
  • Outputs Sine Waves at 11 different frequencies
  • Outputs Pink Noise in two different bandwidths
  • Calibrate loop systems to meet IEC/EN 60118-4 standards
  • Designed for use with the Loop-FSM


Contact Contacta, Inc. for purchase information.

Contacta Inc






Specifications

Specifications

LOOP-TSG Signal Generator

  • Sine Wave Frequencies:
    • 80 Hz
    • 100 Hz
    • 125 Hz
    • 250 Hz
    • 500 Hz
    • 1000 Hz
    • 2000 Hz
    • 4000 Hz
    • 5000 Hz
    • 6300 Hz
    • 8000 Hz
  • Pink Noise Bands:
    • 50 Hz to 5 KHz
    • 50 Hz to 15 KHz
  • Sine Wave Output Level: -10 dBV
  • Sine Wave Quality: <2% THD to 20 KHz
  • Pink Noise Quality: ±½ dB deviation from 1/f from 100 to 5000 Hz
  • Output: 600 Ohms Impedance Balanced XLR
  • Auto Power-Off after 30 minutes of inactivity
  • Designed to confirm loop systems meet IEC/EN 60118-4 standards
  • Runs on one 9V Alkaline battery (included), lasts ~40 hours
  • Unit Dimensions: 4.4" x 2.6" x 1.1"
  • 1 Year Warranty
  • Made in the USA


 

Contacta Loop-FSM

Designed for hearing aid loop calibration

Overview


LOOP-FSM Calibration Meter

True-RMS AC Gaussmeter designed to calibrate audio frequency induction loop (AFIL) systems.  This meter is designed and manufactured by Magnii Technologies for Contacta, Inc.

  • Single Axis True-RMS Measurements
  • Accurately measures AC magnetic fields
  • Wide Bandwidth: 45 to 10,000 Hertz
  • Measurement Range: -60dB to +9dB
  • Selectable Flat Spectrum and Hardware A-Weighted Measurement
  • Third Octave measurements for precise bandwidth tuning
  • Headphone Jack to listen to the loop system as you calibrate it
  • Variable Backlight
  • Calibrate loop systems to meet IEC/EN 60118-4 standards
  • Can be used with the Loop-TSG Signal Generator


Contact Contacta, Inc. for purchase information.

Contacta Inc



Specifications

Specifications

LOOP-FSM Calibration Meter

  • Accuracy: ±0.3 dB at 1 KHz
  • Flat frequency response:
    • ±½ dB 45 to 10,000 Hz
  • Hardware A-Weighted Filter
  • Range -60 to +9 dB (0.005 to 14.176 mG)
  • Resolution: 0.1 dB
  • True RMS Measurements
  • Headphone Output:
    • Up to 1 Watt into 8 Ohm Load
    • Digitally Volume Control
    • Selectable A-Weighted or Flat Frequency Response
  • Third Octave Filters with centers at:
    • 100 Hz
    • 200 Hz
    • 500 Hz
    • 1000 Hz
    • 2500 Hz
    • 5000 Hz
  • Signal Amplitude and Peak Hold
  • Blue LED Backlight, variable brightness
  • Selectable units: dB, milliGauss or microTesla
  • Designed to confirm loop systems meet IEC/EN 60118-4 standards
  • Runs on one 9V Alkaline battery (included), lasts ~21 hours
  • External power jack to run unit with optional AC power adapter
  • Unit Weight (without battery): 6.5 oz
  • Unit Dimensions: 5.5" x 3.6" x 1.13"
  • 1 Year Warranty
  • Made in the USA


 

DSP-523 Gaussmeter: Ignore/Bandpass/Analyze Powerlines

3-Axis EMF meter can IGNORE, BANDPASS and ANALYZE 50/60Hz powerline fields

Overview

DSP-523

   The DSP-523 uses a powerful digital signal processor that sets a new standard for AC gaussmeters.  Now you can ignore powerlines, bandpass powerlines and analyze powerline harmonics, all with one simple meter.

   The first line shows you the total, unfiltered field strength.  The second line shows the field strength with one of four digital filters selected:

  • Ignore 60Hz + Harmonics
  • Ignore 60Hz Only
  • Bandpass 60Hz + Harmonics
  • Bandpass 60Hz Only

   Selectable axis, graphing, max hold, and a variable backlight are just icing on the cake.

  No other gaussmeter has the ability to accurately notch or bandpass powerline fields and harmonics while still passing other frequencies.  Easy to use, and innovative.

 50 Hz European Fields

Need to use the meter in Europe where power line are 50Hz instead of 60Hz?  No problem, you can switch between 50Hz and 60Hz filtering in the menu.  Simple.

BARGRAPH DISPLAY:Bargraph Display

 Applications:

  • Make sure your home's EMF levels are safe
  • Powerline Field Measurements
  • Powerline Quality and Total Harmonic Distortion (THD) analysis
  • Measurement of DC or combustion motor electromagnetic fields
  • Measure hybrid car electromagnetic radiation
  • Appliance Measurements
  • Lab Testing & Calibration
  • Testing notch/noise filters


Ignore Powerlines

Completely Ignore Powerlines

   Let's say you want to measure the fields generated by a combustion or DC motor such as the fields inside your car.  These fields aren't at powerline frequencies, but in the electrically dense environment we live in today, a regular gaussmeter's readings will be distorted by surrounding powerline fields.  How would you measure the 80Hz refresh rate from an LCD monitor?  What about paranormal research, where you're looking for EMF anomalies but want to be sure you're not measuring man-made fields?  What if you could ignore 60Hz and harmonics of 60Hz, to only measure fields NOT related to powerlines?  Now you can.

 

60Hz+Harmonics Notched Frequency Response-PWR Response



Ignores Power Lines


   The picture to the right shows the meter measuring the fields from a transformer, which are at powerline frequencies.  The meter shows a total field strength of 186.8 mG, but the meter ignores it for the second reading, showing just 0.7 mG from other sources:


Ignoring 60Hz Only

   What if you want to measure the field strength of the power line harmonics, or accurately measure a field that is close to a harmonic of 60Hz (190Hz for example)?  The DSP-523 allows you to do this as well, by only ignoring 60Hz, but measuring everything else.

 60Hz Only Notched Frequency Response

-60Hz Response
 

 

Bandpass Powerlines

Bandpass Powerlines

   Take measurements with a narrow bandpass filter centered at 60Hz, allowing you to accurately measure powerlines without distortion from harmonics.  Or, bandpass on 60Hz + Harmonics, which tells you the total field strength due to powerlines, including all harmonics.

60Hz+Harmonics Bandpass Frequency Response@PWR Response

Measuring Power Line Magnetic Fields without Harmonics

   Sometimes you want to see how “clean” the 60Hz sine wave from an AC powered device is. When a sine wave is pure or “clean”, it will only contain the fundamental frequency (60Hz Only), but when a sine wave is “dirty” from power glitches or other faults, it will contain harmonics of the fundamental frequency (120Hz, 180Hz, etc).  Take measurements with a very narrow bandpass filter at 60Hz, and compare that to the overall unfiltered field strength.  For a clean sine wave, these measurements will be almost the same.

60Hz Only Bandpass Frequency Response
@60Hz Response

Specifications

Specifications

  • Accuracy: ±(4% + 4 digits) from 48 to 62 Hertz
  • Flat frequency response:
    • ±½dB 30 to 300 Hz
    • -3dB 15 to 330 Hz
  • Range 0-250 mG (auto-ranging)
  • Highest resolution: 0.01 mG
  • True RMS Measurements
  • Three Axis Detector, selectable (3-Axis, X, Y, Z)
  • Two display styles:
    • On-Screen Graphing of total RMS, Notched and Bandpassed field strength
    • Dual readout: Compare total RMS strength plus select:
      IGNORE 60Hz Only or 60Hz+Harmonics
      BANDPASS 60Hz Only or 60Hz+Harmonics
  • Blue LED Backlight, variable brightness
  • Max Hold on ALL features
  • Update Rate: 1.6 times per second
  • Selectable units: milliGauss or microTesla
  • Runs on one 9V Alkaline battery (included)
  • External power jack to run unit with optional AC power adapter
  • Unit Weight (without battery): 7.2 oz
  • Unit Dimensions: 5.5" x 3.6" x 1.75"
  • 2 Year Warranty
  • Made in the USA

Reviews

Product Reviews

 "The ability to filter 50/60Hz contamination makes the DSP-523 the only truly useful device for investigation and research"  - Stephen Z.

   The DSP-523 has really set a new standard for EMF meters.  It is full-featured, sensitive, easy to operate and overall a sturdy and high-quality device.  In my opinion, the ability to filter 50/60Hz contamination makes the DSP-523 the only truly useful device for investigation and research.

    The controls and interface were also very well designed.  When I first read the documentation I must admit I was a bit intimidated by the myriad of features available on the DSP-523.  However, after using the device for a few minutes I had no trouble understanding the interface and navigating the menus.  That sort of usability for a full-featured device is not trivial to design. - Stephen Z.



"Compared to the DSP-523, the KII meters had no value in the field"  - Michael J.

   I had a chance to use the DSP-523 yesterday on location concurrently with two KII and one Cell Sensor EMF Meters. We also had 3 single axis arrays placed in the area.  Throughout the evening we received several 2-3mg spikes on one of the KII's, one spike on the second KII and one 3mG hit on an array.  We were in a location with no man-made immediate power sources or exterior lighting as it was outdoors with power lines approximately 50 yards away from our central area. Throughout the evening we were also able to clearly see a pattern of stable EMF in the local area measuring .03 - .50 mg on the DSP-523 as well as see the powerline contamination which routinely stayed constant at .10 to frequent 3.90x spikes. Being able to isolate and watch the power line EMF in the field was immediate confirmation of the false positive occasional spikes on the KIIs. The LED was incredibly easy to read throughout the evening as well. There was only one inconsistent reading received the entire evening, which was recorded on the DSP-523 of 4.92 and never replicated and was outside the normal recorded range for the power lines. In my opinion, compared to the DSP-523, the KII meters had no value in the field next to the DSP-523's accuracy and ability to filter power line noise! Even in 33 degree weather, the meter was stable, easy to read with no temperature related issues as well! While 2 of 3 arrays failed prematurely due to battery loss directly related to conditions.  - Michael J.



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Accessories

Hard Carrying Case

Hard Carrying Case

Fits up two meters comfortably, this hard case will keep your equipment protected.  Case dimensions are 10.69" x 9.52" x 3.36" and features pluck-foam so you can customize it to hold any of your equipment!

Select the "With Hard Case" option below when ordering.









9v AC Adapter

9v AC Adapter

9v Adapter allows you to power your meter from a standard (USA) power outlet, saving on battery costs.

Select the "With AC Adapter" option below when ordering.






Instructions

 Download Instruction Manual (pdf format)

$ 309.00
Hard Carrying Case:
No Hard Case Included
With a Hard Case ($16)
AC Adapter (USA Outlet):
No AC Adapter
With AC Adapter ($9.95)

 

MT-263 AC Gaussmeter: Professional AC Measurement

Overview

MT-263

True-RMS 3-Axis AC Gaussmeter with all the features you could want.  Three axis measurement is accurate regardless of meter orientation.  Professional, easy to use and feature rich, all at a great price.

  • 3-Axis True-RMS Measurements
  • Accurately measures AC magnetic fields
  • Wide Bandwidth: 15 to 5500 Hertz
  • Auto-Ranging
  • Max Hold
  • Variable Backlight
  • Graphing
  • Rugged construction

 Innovative Peak-Axis feature tells you which axis has the highest field strength.  Great for tracking down the source of a field!

  • Make sure your home's EMF levels are safe
  • Powerline Field Measurements
  • Non-destructive testing
  • Appliance Measurements
  • Lab Testing & Calibration


BARGRAPH DISPLAY:Bargraph Display



Specifications

Specifications

  • Accuracy: ±(4% + 4 digits) from 48 to 62 Hertz
  • Flat frequency response:
    • ±½dB 30 to 5000 Hz
    • -3dB 15 to 5500 Hz
  • Range 0-250 mG (auto-ranging)
  • Highest resolution: 0.01 mG
  • True RMS Measurements
  • Three Axis Detector, selectable (3-Axis, X, Y, Z)
  • Peak Axis (which axis has the strongest field)
  • On-Screen Graphing (Bargraph of field strength)
  • Max Hold
  • Fastest Update Rate: 2.5 times per second
  • Blue LED Backlight, variable brightness
  • Selectable units: milliGauss or microTesla
  • Runs on one 9V Alkaline battery (included), lasts ~15 hours
  • External power jack to run unit with optional AC power adapter
  • Unit Weight (without battery): 7.2 oz
  • Unit Dimensions: 5.5" x 3.6" x 1.75"
  • 2 Year Warranty
  • Made in the USA

Frequency Response    ±½dB 30 to 5000 Hz

Frequency Response

Accessories

Hard Carrying Case

Hard Carrying Case

Fits up two meters comfortably, this hard case will keep your equipment protected.  Case dimensions are 10.69" x 9.52" x 3.36" and features pluck-foam so you can customize it to hold any of your equipment!

Select the "With Hard Case" option below when ordering.









9v AC Adapter

9v AC Adapter

9v Adapter allows you to power your meter from a standard (USA) power outlet, saving on battery costs.

Select the "With AC Adapter" option below when ordering.






$ 259.00
Hard Carrying Case:
No Hard Case
With Hard Case ($16)
AC Adapter (USA Outlet):
No AC Adapter
With AC Adapter ($9.95)