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Radiation Alert Ranger EXP Detector

The Radiation Alert Ranger EXP Detector is a maximum performance, lightweight, rugged nuclear radiation detector to use for surveys in the field or at your facility.

For pricing, please call 1-800-952-3293 or email




The Radiation Alert Ranger EXP, seamlessly combines performance with unparalleled portability. Whether you’re surveying facility or venturing into the field, the Radiation Alert Ranger EXP stands as a reliable companion, designed with industrial environments in mind while retaining all the features cherished in laboratory settings.

Compact and lightweight, the Radiation Alert Ranger EXP is a handheld digital survey meter that sets the bar for sensitivity to NORM and low levels of alpha, beta, gamma, and x-rays ensuring comprehensive coverage for your radiation detection needs.  Equipped with built-in efficiencies for common isotopes, this model goes the extra mile by calculating activity in Becquerels (Bq) and Disintegrations Per Minute (DPM).

It is user-friendly interface featuring a backlit digital display, a red count light, and a  beeper that signals each count detected, enhancing your ability to respond promptly to radiation levels. Selectable alert levels, an adjustable timer further flexibility. allowing you to tailor the device to you specific requirements.

  • Free Observer USB Software
  • Free Observer BLE Software For Use With The Optional Bluetooth Module

But the Radiation Alert Ranger EXP doesn’t stop there.  Included with your purchase is the Free Observer USB Software(compatible with Windows only), enabling you to effortlessly download and manage your data while setting up computer alarms for added convenience.

For an enhanced experience, the optional Bluetooth module opens up a world of possibilities.  The Radiation Alert Ranger EXP seamlessly integrates with the free Radiation Alert Observer BLE app available for download from the Google App Store.  This app empowers you to display real-time readings with descriptions, conduct timed counts, append GPS data, and send your saved survey files. What’s more, any alarms set on the instrument will be mirrored on you android device, ensuring you stay informed and in control.

Each unit includes an external pancake probe, rubber boot, stand, USB cable, 2 AA batteries and free observer software.


Additional information

Weight N/A



Detector RAP-RS2 Probe, external halogen quenched uncompensated GM tube with thin mica window 1.4-2.0 mg/cm2 areal density
Output USB and Bluetooth 4.1 for use with included Observer Software and Apps RadResponder Ready
Operating Ranges mR/hr: .001 to 100
nSv/hr: .01 to 1,000
CPM: 0 to 350,000
CPS: 0 to 5,000
Total Timer: 1 to 9,999,000 counts
Built In Efficiencies 35Sulfer (S35), 90Strontium (Sr/y90), 137Cesium (Cs137), 32Phosphorus (P32), 14Carbon (C14), 131Iodine (I131), 60Cobalt (Co60) and Alpha
Accuracy (Cs137) Typically ±15% from factory, ±10% with NIST Source Calibration
Energy Sensitivity Alpha down to 2 MeV
Beta down to .16 MeV, Typical detection efficiency at 1 MeV is about 25%
Gamma down 10 KeV through the detector window, smallest detectable level for I125 is .02 µCi at contact
Anti Saturation Meter will hold at full scale in fields as high as 100 times the maximum reading
Alert mR/ht: .001 to 100
CPM: 1-350,000
Display Backlit LCD with mode indicators
Count Light Red LED flashes with each count
Audio Indicator Internally mounted beeper, can be switched to silent mode
Power 2 AA alkaline batteries or USB
Weight 1.25 pounds
Size 10.25″ x 2.7″ x 1.3″


Radiation Alert Ranger EXP Detector Datasheet

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