Ranger EXP Geiger Counter


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3.00 LBS
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The Ranger EXP is the external probe model of the Ranger "pocket" Geiger counter, where essentially, the sensor or Geiger-Mueller (GM) tube, is relocated from the Ranger's pocket model enclosure to the end of a wand-style probe instead, connected to the base survey meter with a probe cable.

The Ranger EXP offers maximum performance in a lightweight, rugged solution for using your survey meter in tough industrial environments in the lab or in the field.  With its oversized, pancake style GM tube, it offers excellent sensitivity to low levels of Alpha, Beta, as well as Gamma and X-raysThe EXP's survey meter is now smaller, more ergonomic, and with better features, all for the same price!  The Ranger EXP features a new interface with touchpad technology, and included with each instrument at no extra charge is an integrated, protective boot.  Other features: 


  • Small, handheld, microprocessor-based instrument
  • Excellent sensitivity to low levels of Alpha, Beta, Gamma, and X-rays
  • Backlit digital display
  • Red count light
  • Audible Beeper that sounds with each count detected, providing instant indications of the radiation level.
  • Selectable alert levels
  • Adjustable timer for performing Timed Counts
  • Built in efficiencies for common isotopes to calculate activity in Bq and DPM. (Important: The Ranger does not identify isotopes - to use this feature,  you must know the isotope in advance).
  • Internal memory, data logging, and USB connectivity
  • Free Observer USB Software to download your data, set computer alarms, and calibrate your instrument!
  • Bluetooth for use with the Free Observer BLE App for Android.





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 45 mm (1.75 in.).

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.
Gamma Sensitivity is
3340 CPM/mR/hr (137Cs).
Smallest detectable level for 125I is .02 µCi at contact.Energy Response Curve                

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)

Data Logging Capacity

5,452 data points, which at 1 minute intervals as an example, equates to 3.7 days


USB for use with Free Observer USB Software for PCs

Power Requirements

Two AA alkaline batteries (included)


140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.)     Probe: 260 X 70 X 25 mm (10.25 X 2.75 X 1 in.)


Probe Cable

The cable connecting the meter to the probe is a full 36" long, while the probe handle itself is 10" long, allowing for detection at a distance, thus reducing the chance of contamination of hands or gloves while scanning and frisking.


Carrying Case, Xtreme Boot, Stand, Mini-USB Cable, Observer USB Software Download, Certificate of Conformance


NIST Calibration

Limited Warranty

1 year limited warranty


Click on this link for the:

Ranger and Ranger EXP Operating Manual



3 Reviews Hide Reviews Show Reviews

  • 5

    Posted by Rainer on Nov 8th 2022

    Das bestelle Gerät kam schnell bei mir an. Die Performance, Bedienungsfreundlichkeit und Displaygrösse ist beachtlich. Ich bin mit dem Produkt und der Firma Geigercounters sehr zufrieden und würde -was ich auch gemacht habe- immer wieder bestellen.

  • 5
    An advisable purchase

    Posted by Unknown on Oct 30th 2016

    A practical device, very useful and reliable in any environment. It is attractive especially if coupled with Xtreme boot to protect it. A recommended purchase for those who need to make reliable measurements quickly and safely.

  • 5
    Excellent Detector

    Posted by Ben Croftchik on Sep 29th 2016

    As accurate as some $2500 counters! Service from this company is fantastic!!!