• Radiation Alert® Ranger

    The Ranger features built in isotope efficiencies, internal memory, great sensitivity, backlit display, timer and an optional wipe test plate for swipes.

The Ranger / Radiation Survey Meter - a ß y x


The Ranger offers maximum performance in a lightweight, rugged solution for surveying at the facility or in the field. The Ranger has been designed for industrial environments, but it still has all of the features you’ve come to love in the lab. The Ranger is a small, handheld, digital instrument which offers excellent sensitivity to low levels of alpha, beta, gamma, and x-rays. It has built in efficiencies for common isotopes to calculate activity in Bq and DPM. It has a backlit digital display, a red count light, and a beeper that sounds with each count detected. Other features include selectable alert levels, an adjustable timer, and an optional wipe test plate for swipes. Internal memory and the free Observer USB Software allow you to download your data, and set computer alarms. Ranger Quick Specs PDF


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

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. 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.


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.
Energy Response Curve


Graphic Display with Backlight

Count Light

Red LED flashes with each radiation event

Audio Indicator

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


USB for use with Free Observer USB Software for PCs

Power Requirements

Two AA alkaline batteries (included). Approx. 800 hrs @ background

Temperature Range

-10° to 50°C (14° to 122°F)


140 X 68 X 33 mm (5.5 X 2.7 X 1.3 in.)


10.3 oz (0.64 lbs.)


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


Wipe Test Plate, Swipes, NIST Calibration

Limited Warranty

1 year limited warranty


Operation Manual English | Spanish | HTML Version | Ranger Quick Specs PDF | Frequently Asked Questions | Quick Start Video Guide |

Monitor 200
The Ranger
The Ranger EXP
Monitor 1000EC
a ß y x y x
Internal Memory
Included Protective Boot
Included Stand
Built-In Isotope Efficiences    
GM Detector Internal Internal External (EXP) Internal
mR/hr .001(1µR) to 200 .001(1µR) to 100 .001 (1µR) to 1000 mR/hr
µSv/hr - .01 to 2000 .01 to 1000 .01 to 10000
mSv/hr n/a n/a 0.00001 to 1
Counts Per Minute 0 to 214,000 0 to 350,000 0 to 450,000
Counts per Second 0 to 3575 0 to 5000 0 to 7500
Total Timed Counts 1 to 9,999,000

Accessories / For The Ranger Radiation Detector, Survey Meter, and Geiger Counter

Radiatino Alert Ranger


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