Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP
Ranger EXP

Radiation Alert® Ranger EXP

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).

The Radiation Alert Ranger® EXP has a 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.

Applications & Uses: Surveying for NORM (Naturally Occurring Radioactive Material) contamination, Gross wipe counting, Contamination surveys of packages, equipment, people, etc., Regulatory inspections, Scrap Metal Screening, Low energy radionuclide detection

Digital Radiation Detector Comparison | Contact For Pricing and Availability


radiation_icon_bllack alpha_icon_black beta_icon_black gamma_icon_black x-ray_icon_black

Here, are some features of the radiation detector device that is worth mentioning. RAP-RS2 Probe – External Probe 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

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.

Ranger, Ranger EXP, & Frisker Energy Response

Built-In Efficiencies

Sulfur (35S), Strontium (90Sr/y), Cesium (137Cs), Phosphorus (32P), Carbon (14C), Iodine (131I), Cobalt (60Co), and Alpha


Reference to Cs137
Typically ±15% from factory, ±10% with NIST Source Calibration NIST Calibration Additional


Selectable Alert Settings


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.


Included with Ranger EXP

EXP Carrying Case Stand
Carrying Case Stand
Observer BLE  Observer Software
Observer BLE App for Andriod Observer USB Software
Extreme Boot  
Extreme Boot  



Averaging Periods

This Radiation detector 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


USB for use with Free Observer USB Software for PCsBluetooth Option: Wirelessly connects the instrument with an Android mobile device for use with Free Observer BLE App

Count Light

Red LED flashes with each radiation event.

Audio Indicator

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

Power Requirements

USB Power or Two (2) AA alkaline batteries (included). Approx. 800 hrs @ background.

Temperature Range

-10° to +50°C (14° to 122°F)


10% to 70% Non-Condensing.


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.)


570 g (1.25 lbs.)


RAP-RS2 External GM Probe, 3 ft BNC Cable, Carrying CaseXtreme Boot, Lanyard, Stand, Batteries, Mini-USB Cable, Observer USB Software, Observer BLE App, Certificate of Conformance


NIST Calibration,  Radiation Response Kit
Bluetooth module available for use with Obsever BLE software and Rad Responder

Limited Warranty

1 year limited warranty



Ranger EXP Options

 RRK Kit        
Radiation Response Kit