Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger
Radiation Alert® Ranger

Radiation Alert Ranger

Introducing the Radiation Alert Ranger®, the pinnacle of nuclear radiation detection technology that seamlessly combines performance with unparalleled portability. Whether you're surveying facility or venturing into the field, the Radiation Alert Ranger® 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® is a handheld digital survey meter that sets the bar for sensitivity across 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® boasts a user-friendly interface featuring a backlit digital display, a red count light, and a distinctive beeper that signals each count detected, enhancing your ability to respond promptly to radiation levels. Selectable alert levels, an adjustable timer, and an optional wipe test plate for swipes provide 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® 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® 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.

Elevate your radiation detection capabilities with the Radiation Alert Ranger®- where cutting-edge technology meets user-friendly design, providing peace of mind whether in the lab, facility, or in the field.

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

Helpful Videos
Radiation Alert Ranger® - Radiation Detector-Taking a Timed Count

Radiation Alert Ranger® Radiation Detector- Setting the Alarm

Radiation Alert Ranger® Radiation Detector- Backlight

Radiation Alert Ranger® Radiation Detector- Silent Operation

Digital Radiation Detector Comparison | Contact For Pricing and Availability




Internal Halogen-quenched, uncompensated GM tube with thin mica window, 1.4-2.0 mg/cm2 areal density. Effective diameter of window is 45 mm (1.77 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

Ranger front and back

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 and X-rays 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


Graphic LCD with Backlight

Anti Saturation

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

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.

Included with Ranger

Option Carry Case                 Stand  
Carrying Case Stand  
Observer BLE  Observer Software  
Observer BLE Software for Android Observer USB Software  
Extreme Boot Ranger back with tube cap   
Extreme Boot Ranger with Tube Cap   



USB for use with Free Observer USB Software for PCs Bluetooth Option additional: 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.


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. Pulsating beeper sounds the alert. Adjustable alert levels are used for mR/hr / CPM, and µSv/hr / CPS. 70db @ 1m. Alarm will sound when in Timer Mode when set alarm threshold is reached.

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.)


291g (0.64 lbs.)


Carrying Case, Xtreme Boot, Lanyard, Stand, Batteries, Mini-USB Cable, Observer USB Software, Observer BLE Software, Certificate of Conformance


Wipe Test Plate, Swipes, Water Resistance Case, NIST Calibration
Bluetooth module available for use with Observer BLE APP and Rad Responder

Limited Warranty

1 year limited warranty


Ranger Options

 WipeTest Plate Swipes      Water reisitant case
WipeTest Plate Swipes Protective Water-Resistant case
Rad Respinse Kit    
Radiation Response Kit