The unit measures alpha, beta, gamma and x-radiation using a 2-inch “pancake” GM detector with high sensitivity to common beta and alpha sources. The easy-to-read digital display shows readings in your choice of µSv/hr, mR/hr, CPM, or CPS. The Total/Timer feature allows timed readings from one minute to 40 hours for precise measurement of low level contamination. An audible alert sounds when the radiation reaches a user-adjustable level.

  • Quickly alerts the user to the presence of harmful levels of nuclear radiation
  • Improves safety in the laboratory and in the field
  • Automatically compensates for GM tube dead time
  • Will not jam in high radiation fields
  • CE Certified, RoHS Compliant & Meets WEEE standards


Sensor: Halogen-quenched Geiger-Mueller tube. Effective diameter 1.75″ (45 mm). Mica window density 1.5-2.0 mg/cm²

Display: 4-digit liquid crystal display with mode indicators

Accuracy: ± 10% typical; ±15% maximum

Alert: µSv/hr: 0 to 500; mR/hr: 0 to 50; CPM: 0 to 160,000; Beeper sounds the alert

Anti-Saturation: Readout holds at full scale in fields up to 100 times the maximum reading

Audio: Beeper chirps with each radiation event (can be muted)

Averaging Periods: Display updates every 3 seconds, showing the average for the past 30-second time period at normal levels. The averaging period decreases as the radiation level increases.

Certifications: CE Certified: Emissions: EN 55011:98 + A2 (Class B emissions limits); EN 61326:06 (Class B) RF Emissions Immunity: EN 61326:06 (Annex C) Portable Test and Measurement Equipment; EN 61000-4-2:95 (ESD); EN 61000-4-3: 97; RoHS Compliant, Meets WEEE standards, and ISO 9001:2001 & ISO 14001

Count Light: Red LED flashes with each count

Detector: Halogen-quenched Geiger-Mueller tube. Effective diameter 1.75″ (45 mm). Mica window density 1.5-2.0 mg/cm² Detects Alpha, Beta, Gamma, and X-radiation

Efficiency: For 4 pi at contact Beta
C-14 (49 keV avg. 156 keV max.): 5.3%
Bi-210 (390 keV avg. 1.2 MeV max.): 32%
Sr-90 (546 keV and 2.3 MeV): 38%
P-32 (693 keV avg. 1.7 MeV max.): 33%
Am-241 (5.5 MeV): 18%

Gamma Sensitivity: 3500 CPM/mR/hr referenced to Cs-137 Smallest detectable level for I-125 is .02 mCi at contact


Operating Range: µSv/hr: .01 to 1,100 mR/hr: .001 to 110 CPM: 0 to 350,000 CPS: 0 to 5,000 Total: 1 to 9,999,000 counts

Options: Wipe Test Plate – Retail Price: $75.00 (for U.S. domestic orders only – shipping and handling is $9.00 additional)

Ports: Output: Stereo 3.5 mm jack sends counts to computers, data loggers, other CMOS-compatible devices, earphones, and educational data collection systems. 0-9 V, 1 kOhm impedance. Input: 2.5 mm mono jack provides calibration input. 0-3.3 V, > 5 µs width, rising edge triggered.

Power: One 9-volt alkaline battery; battery life is average 2,000 hours typical, 700 hours minimum at normal background radiation levels at sea level. Battery life decreases as radiation level rises.

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

Temperature Range: -20º to +50º C , -4º to +122º F

Timer: Can set sampling periods of 1 minute to 40 hours.

Weight: 323 grams (11.4 oz) including battery



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