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 Ranger EXP is a high performance, durable, lightweight radiation detector for field use or in your facility. This Radiation detector is designed specifically for individuals operating in tough environments. The small, handheld Geiger counter offers excellent sensitivity to NORM and 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, and set alarms!

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

Internal memory and the free Observer USB Software (Windows® only) allow you to download your data, and set computer alarms. With the optional Blue Tooth module you can download Free Radiation Alert® Observer BLE app from the Google App Store, where you can display the readings from your detector on your android device, label sample readings and descriptions, take timed counts, append GPS data and send your saved survey file. Alarms set on the instrument will also activate on your android device.

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

Applications & Uses: Surveying for NORM (Naturally Occurring Radioactive Material) contamination, 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