Ranger Survey Meter


Ranger Survey Meter


The Ranger is a microprocessor controlled radiation measuring instrument which offers excellent sensitivity to low levels of alpha, beta, gamma and x-rays. The digital readout is displayed with a red count light and audible beep, providing instant indications of the radiation level. Additional benefits include an adjustable timer and external calibration controls. Now with USB and the included Observer USB Software, you can download your data from the internal memory, set computer alarms and calibrate your instrument.

  • Count range: 1 to 9,999,000 counts
  • Range: 0-350,000 cpm
  • Red LED count light
  • Audible beeper (can be switched off)
  • External calibration controls
  • Adjustable timer from 1 to 24 hours; default is 10 minutes
  • User selectable display for mR/hr or µSv/hr, CPM and CPS
  • Internal Memory
  • Observer USB Software downloaded
  • Includes case
  • Wipe test plate positions wipe directly in front of detector at 1 cm distance; protects GM from damage/contamination when meter is not in use


  • Detector: Halogen-quenched uncompensated GM tube with thin mica window, 1.4-2.0 mg/cm2 areal density.
  • Window: 1.77" (45 mm) effective diameter
  • Display: Backlit graphic LCD with backlight
  • Averaging Periods: Display will update every three seconds. At low background levels, the update is the moving average for the past 30-second time period. Time period for moving average decreases as radiation level increases.
  • Gamma Sensitivity: 3340 cpm/mR/hr (referenced to Cs-137); smallest detectable level for I-125 is .02 µCi at contact
  • Operating Range:
    - mR/hr - .001 (1µR) to 100; CPM - 0 to 350,000
    - µSv/hr - .01 to 1000; CPS - 0 to 5000
  • Energy Sensitivity: Detects Alpha down to 2 MeV. Detects Beta down to 0.16 MeV; typical detection efficiency at 1 MeV is approx. 25%. Detects Gamma down to 10 KeV through the end window.
  • Accuracy (Referenced to Cs-137): Typically ± 15% from factory.
  • Timer: One minute to 24 hours, default is 10 minutes
  • Count Light: Red LED flashes with each radiation event
  • Audio Indicator: Internally mounted beeper (can be switched off for silent operation)
  • Outputs: USB
  • Menu: Options accessed by holding down menu button. Pressing the menu button toggles you through functions. Select “+” or “–” to change setting.
  • Built-In Efficiencies: (S-35), (Sr/Y-90), (Cs-137), (P-32), (C-14), (I-131), (Co-60), and alpha
  • Power Requirements: Two AA alkaline batteries, included.
  • Dimensions: 2.7" w x 1.3" depth x 5.5" h (68 x 33 x 140 mm)
  • Weight: 8 oz (227 grams) without battery
  • Warranty: One year

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