GCA-07 Digital Geiger Counter






When safety counts,

accuracy you can trust.


Whether industrial, medical, educational, research or to detect radiation in the home, NRC certifiable. Delivering accuracy when accuracy matters most!

Buy Button


Why NRC Certification is important!

digital geiger counter gca-07w

GCA-07W Digital Geiger Counter



         1) Detects environmental radioactivity.
         2) Measures background radiation and anything above background radiation.
         3) Government NRC certified* accurate Digital Geiger counters
         4) Free Technical Support.


Radiation and Geiger Counter Specialists and Experts         Images SI Inc. BBB Business Review

Get your money's worth. Don't buy an inferior product read our:
Special PDF File. "How to buy a Geiger counter!"
pdf icon
Because of the increasing interested in detecting radioactive contamination in food and the environment we are writing a paper that shows you how-to check for radioactive contamination. If you want to receive this PDF file, sign up to receive our PDF file "How to Buy a Geiger Counter" and this new PDF file will be sent to you as soon as it is completed.

The EPA has increased the amount of allowable radioactive contamination, read more.


Don't count on them to tell you, count on the GCA-07 and tell them.




GCA-07 Digital Geiger Counter

GCA-07 Digital Geiger Counter

Detects Alpha, Beta, X-rays and Gamma radiation

Compare GCA-07W and GCA-07

Two Configurations

GCA-07W and GCA-07 (Internal Tube)

Geiger Counter Software
Windows Software included with purchase

Software to track and graph your Geiger counter's findings is included with your purchase.

High Contrast LCD

High Contrast LCD

Provides CPS/CPM data and its equivalent radiation level

External wand of the GCA-07W

External wand of the GCA-07W

.85" diameter and 5.75" long
Read more

Basic Port
Basic Port

External Power, Head Phone, USB Serial/TTL.

USB to 3.5mm
USB to 3.5mm Cable

The USB TTL Serial cable provide connectivity between USB and serial UART interfaces at 5V.
Read more

NRC Certification Available
NRC Certification Available

We don't just say our Geiger counters are accurate we can certify it.
Read more

Example Frame

Serving a Mission of Moving Science Forward

Digital Geiger Counter Technical Data




Buy Button

Radiation Detected
Alpha, Beta, X-Rays and Gamma.


Radiation Detector
Geiger-Muller Tube: Ne + Halogen filled with a .38" effective diameter 1.5-2.0 mg/cm2 mica end window.


Detector Sensitivity
. Alpha above 3.0 MeV
. Beta above 50 KeV
. Gamma above 7 KeV


Countable Pulse Resolution & Range 1 Count Per Minute (CPM) - 5000 Counts Per Second (CPS)

Radiation readout is switch selectable between Imperial and Metric measurements:

Radiation Resolution & Range (Imperial) 1.0 uR/hr - 1000 mR/hr | (Metric) 0.01 uSv/hr - 10.0 mSv/hr


The GCA-07 detects background radiation as well as NORM (Naturally Occurring Radioactive Materials) and TENORM (Technologically Enhanced Naturally Occurring Radioactive Materials) objects in your environment.

Detector Features:




  • NRC Certification Icon

    NRC Certification

    The GCA-07W and GCA-06W are the only Digital Geiger Counter in their price range accurate enough to be NRC calibrated and certified. The NRC certifications are available at additional cost.*
  • Radiation Warning Symbol

    Measures: Alpha, Beta, X-ray and Gamma Radiation

    The GCA-07 series of Geiger counters can detect and measure alpha, beta, x-ray and gamma radiation.
  • audio speaker output

    Audible Speaker Output

    Each radioactive particle detected produces an audible click to indicate the
    presence and strength of radiation.
    Audio output may be turned on and off.
  • simple interface

    Simple User Interface

    Enjoy an intuitive and easy-to-use interface.
  • Configurable Measurement Window

    Selectable one second or one minute measurement duration to allow both Counts Per Second (CPS) and Counts Per Minute (CPM). CPM measurement is suitable for background radiation measurements.
  • Geiger counter headphone jack

    Headphone Jack

    Listen to the audio output using external headphones attached to the 3.5mm jack socket.
  • Geiger Counter easy to read LCD display

    High Contrast LCD Screen

    CPS and CPM measurements are read on first line. Equivalent radiation is calculated on second line. Readable in low light conditions using LCD screen's backlight.

  • Low Battery Indicator

    Low Battery Indicator

    External Power Supply Jack
    for AC adapter.


Leading our competitors:



  • fast next day shipping

    Fast Shipping

    We ship most domestic orders by the next business day.
  • expert staff staff available to answer questions

    Expert Staff

    We can answer any questions you may have.

  • free online interactive tutorials

    Free Tutorials

    We have free interactive tutorials on our product and software functionality and features.
  • Best Value Geiger Counter

    Value Product

    The GCA-07 is certifiable accurate radiation detection instrument suitable for use in the laboratory, classroom and industry.
Buy from Amazon.com



Free online software updates and support pages available.

Try Before You Buy - Rentals
Images SI Inc., is a U.S. based company that manufactures and assembles in the United States.
* NRC Certification is available from an independent U.S. Government licensed laboratory at an additional cost.

Risk Free Money Back Guarantee!

If our Geiger counter doesn't meet your needs, or for any reason you are not completely satisfied, just let us know within 30 days and we will issue you a UPS Merchandise Return Label for a no hassle refund.
      Returns must be in new and unused condition.

GCA-07 - $429.95 

Digital Geiger Counter

GCA-07W - $489.95 

Digital Geiger Counter with Wand



Additional Options:
NRC Certification - $125.00