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S.E. International Ranger EXP External Probe


Ships direct from our supplier. Expected delivery is 1 to 3 weeks.

The CurtisDifference

Our CommitmentTo You

The Ranger EXP offers maximum performance in a lightweight, rugged solution for using your survey meter in the field. The Ranger EXP is designed specifically for individuals operating in tough environments. The small, handheld unit offers excellent sensitivity to low levels of alpha, beta, gamma, and x-rays. The digital readout is displayed with a red count light and a beeper sounds with each count detected. Other features include an adjustable timer, selectable alert, and with the free Observer USB Software Family, you can download your collected data, set alarms, and calibrate your meter.

  • RAP-RS2 Probe - External Halogen-quenched, uncompensated GM tube with thin mica window, 1.4-2.0 mg/cm2 areal density. Effective diameter of window is 1.75".
Operating Range
  • mR/hr - .001 (1µR) to 100
  • CPM - 0 to 350,000
  • µSv/hr - .01 to 1000
  • CPS - 0 to 5000
  • Total Counts- 1 to 9,999,000 counts
  • Accuracy (Referenced to Cs137)
  • Typically ±15% from factory, ±10% with NIST Source Calibration
Energy Sensitivity
  • Detects Alpha down to 2 MeV. Detects Beta down to .16 MeV; typical detection efficiency at 1 MeV is
  • approx. 25%
  • Detects Gamma down to 10 KeV through the detector window. 3340 CPM/mR/hr (137Cs)
  • Smallest detectable level for 125I is .02 µCi at contact
Built-In Efficiencies
  • Sulfur (35S), Strontium (90Sr/y), Cesium (137Cs), Phosphorus (32P), Carbon (14C), Iodine (131I), Cobalt (60Co), and Alpha

Selectable Alert Set Range
  • mR/hr .001 - 100 and CPM 1 - 350,000. 70db @ 1m. Pulsating beeper sounds the alert. Adjustable alert levels are used for mR/hr / CPM, and µSv/hr / CPS. Alarm will sound when in Timer Mode when set alarm threshold is reached.

  • Meter will hold at OVER RANGE in fields as high as 100 times the maximum reading.

Averaging Periods
  • Display updates every 3 seconds. At low background levels, the update is the average for the past 30-second time period. The timed period for the average decreases as the radiation level increases.
  • Graphic LCD with Backlight

Count Light
  • Red LED flashes with each radiation event.

Audio Indicator
  • Internally mounted beeper (can be switched off for silent operation)

  • USB for use with Free Observer USB Software Family

Power Requirements
  • Two AA alkaline batteries (included). Approx. 800 hrs @ background

  • 5.5" x 2.7" x 1.3" 

Probe Size
  • 10.25" x 2.75" x 1" 

  • RAP-RS2 External GM Probe, Carrying Case, Xtreme Boot, Lanyard, Stand, Mini-USB Cable, Observer USB Software Download, Certificate of Conformance

  • NIST Calibration

Limited Warranty
  • 1 year limited warranty