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International Medcom CRM-100 Radiation Monitor

This product is now obsolete and has been replaced by the Radalert 100X.

The CRM-100™ is a general purpose geiger counter that measures alpha, beta, gamma, and x-radiation.

It is intended for personal safety and educational purposes. Like the popular Radalert 100™, the CRM-100™ features a 3-second update on its digital liquid crystal display (LCD).

The LCD shows the current radiation level in your choice of milliroentgens per hour from .001 to 110 or counts per minute (cpm) from 0 to 350,000.

When SI units are selected, the LCD shows readings in microsieverts per hour from .01 to 1100 or counts per second (cps) from 0 to 3,500. This instrument also offers an accumulated total and timer function, up to 9,999,000 counts and 40 hours.

A red LED blinks and a beeper chirps with each count (the chirp can be muted).


  Halogen-quenched Geiger-M�ller detector (LND712)
  Mica end window density is 1.5-2.0 mg/cm²
  Side wall is 0.012" #446 stainless steel
  Detects Alpha, Beta, Gamma, and X-radiation

Display: 4-digit liquid crystal display with mode indicators

Accuracy: ±10% typical; ±15% max. (mR/hr and µSv/hr modes)

Alert: No Alert feature. If your intended application requires a user-adjustable Alert, we recommend the Radalert 100™

Audio: Beeper chirps for each count (can be muted)

Calibration: Cesium 137 (gamma)

Certifications: CE Certified, RoHS Compliant, and Meets WEEE standards

Count Light: Red LED flashes with each count

Designed & Manufactured: Designed in USA by International Medcom, Inc. Manufactured in Thailand under ISO 9001:2001 & ISO 14001 Certification

Operating Range:

  mR/hr: .001-110 CPM: 0-350,000
  µSv/hr: .01-1,100 CPS: 0-3,500
  Total: 0-9,999,000 counts Timer: up to 40 hours

Options: Computer cable and software (Windows compatible)


  Output: Stereo 3.5 mm jack sends counts to computers, data loggers, other CMOS-compatible devices, and headphones
  Input: Mono 2.5 mm jack provides electronic calibration input

Power: One 9-volt alkaline battery; average battery life is 2160 hours at normal background, 625 hours at 1 mR/hr with beeper off

Sensitivity: 1000 cpm/mR/hr referenced to Cs-137

Size: 150 x 80 x 30 mm (5.9" x 3.2" x 1.2")

Weight: 225 grams (8 oz) including battery

Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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