Qal-Tek Associates

Model CRM-100 - General Purpose Geiger Counter



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 100X, 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).

  • Low Cost
  • 0-350,000 CPM
  • .001-110 mR/hr
  • Digital Numeric Display
  • End Window GM Detector
  • Integration Function

  • Sensor:
    • Halogen-quenched Geiger-Mueller 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
    • Sensitivity: 1000 cpm/mR/hr referenced to Cs-137
    • 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 100X
    • 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
  • 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
  • Ports:
    • 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 2,160 hours at normal background, 625 hours at 1 mR/hr with beeper off
  • Size: 150 x 80 x 30 mm (5.9″ x 3.2″ x 1.2″)
  • Weight: 225 grams (8 oz) including battery

  • Computer cable and software (Windows compatible)

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