NRC certifiable* accuracy

--When accuracy matters

Industrial, Medical, and Education.

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Why NRC Certification is important!

GCA-03 Digital Geiger Counters

Only NRC Certified Geiger Counters
Give Proven Accurate and Reliable Measurements

Not all Geiger Counters are the same.

Many manufacturers are happy to compete on price, none of them want to compete with us on quality or accuracy.

Why? Because our Digital Geiger Counters are NRC ready to be “NRC Certified” – To be NRC certified our Geiger counters are sent to an independent United States Government licensed nuclear laboratory, where it tested against the strict guidelines and standards of the U.S. Nuclear Regulatory Commission.

NRC Certification tells you the Geiger counter is as accurate as “accurate” can be! With an NRC-certified Geiger counter, your radiation reading reports are authoritative and acceptable to governmental agencies.

NRC CERTIFICATION READY - NRC certification can only be given by U.S. Government licensed laboratory. The NRC certificate certifies that the radiation reading from the Geiger counter is accurate.
DETECTOR SENSITIVITY: Detects Beta radiation above 50 KeV; X-Ray and Gamma radiation above 7 KeV
COUNTING RESOLUTION AND RANGE: 1 Count Per Minute (CPM) - 5000 Counts Per Second (CPS)
RADIATION RESOLUTION AND RANGE: 0.001 mR/hr resolution / 500 mR/hr Range (Imperial measurements); 0.01 uSv/hr resolution - 10 mSv/hr range (Metric)


  • Outputs Digital Counts Per Second (CPS) value
  • Outputs radiation level (imperial / metric)
  • LCD Backlight

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Digital Geiger Counter Technical Data,

Detector Features:

  • NRC Certification

    With NRC certification you have a independent US gov't license laboratory testing and certifying your Geiger counter's accuracy. NRC certifications are available at additional cost.*
  • Radiation Warning Symbol

    Radiation Detected and Measured: Beta, X-ray and Gamma Radiation

  • audio speaker output

    Audible Speaker Output

    Each radioactive particle detected produces an audible click.
    Audio output may be turned on and off.

    Headphone Jack

    For private listening.
  • simple interface

    Simple User Interface

    Front panel switches provide an intuitive and easy-to-use interface for all Geiger counter functions.
  • Configurable Measurement Window

    Selectable Time Modes:
    Counts Per Second (CPS) or Counts Per Minute (CPM).
  • Geiger Graphing Software

    Graphing Software

    Graphing software for the WIN7 operating system is available. Features threshold alarms, CPS or CPM modes. Graphs in lines, bars, 3D lines and 3D bars.
  • Geiger Counter easy to read LCD display

    High Contrast LCD Screen

    Easy to read Count measurements and Equivalent radiation level. Backlight available for low light conditions.

  • Low Battery Indicator

    Low Battery Power Indicator

    * External Power Supply
    (AC adapter) included.

Leading our competitors:

  • Educational Institutions Discount

    Educational Discount

    Schools and educational institutions get a 10% discount. Call for promo code at 1-800-230-4535
  • expert staff staff available to answer questions

    Expert Staff

    We can answer any questions you may have.

  • free online interactive tutorials

    Software Tutorials

    Online Radiation detection and monitoring interactive tutorials. See more...
  • Best Value Geiger Counter

    Value Product

    Certifiable accurate radiation detection and measurement instrument.

Free Lite Geiger Graphing Software .

Online Radiation Penetration Calculator

Case Size 5.6" x 3.2" x 1.5" .PDF Drawing (50K)

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.
Add two weeks to delivery of GCA-03W or GCA-03 for NRC Certification. Please note that NRC Certification fee is non-refundable.

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.
      Returned merchandise must be in new and unused condition.

GCA-03 Geiger Counter

Select Configuration:

Additional Options

Belt Clip Add $10.00

NRC Certification Add $125.00

International AC Adapter for Images Geiger Counters

Pelican Case for Images Geiger Counters