• Handheld Radiation Detector

Handheld Radiation Detector


To purchase an equivalent product, see the Ranger from SE International. Learn More


The Inspector is a small, handheld, microprocessor-based instrument which offers excellent sensitivity to 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, external calibration controls and adjustable alert.


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 (1.75 in.). Radiation symbol on front label marks the center of the detector.

Averaging Periods

Display will update every 3 seconds. At low background levels, the update is the moving average for the past 30-second time period. The timed period for the moving average decreases as the radiation level increases.

Operating Range

mR/hr - .001 (1μR) to 100 CPM - 0 to 350,000 μSv/hr - .01 to 1000 CPS - 0 to 5000 Total/Timer - 1 to 9,999,000 counts

Accuracy (Cs137)

mR/hr ±10% typical (NIST), ±15% max - 0 to 100 μSv/hr ±10% typical (NIST), ±15% max - 01 - 1000 CPM ±10% typical (NIST), ±15% max - 0 to 350,000

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 end window. 3340 CPM/mR/hr (Cs137). Smallest detectable level for I125 is .02 μCi at contact.




4 digit liquid crystal display with indicators.

Alert Set Range

mR/hr .001 - 50 and CPM 1 - 160,000. 70db @ 1m.

Count Light

Red LED flashes with each radiation event.

Audio Indicator

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


Dual miniature jack drives CMOS or TTL devices: count to computer or datalogger.

Submini jack input allows for electronic calibration


Meter will hold at full scale in fields as high as 100 times the maximum reading.

Power Requirements

One 9-volt alkaline battery. Battery life is approx. 2160 hours at normal background.

Temperature Range

-10º to 50ºC (14º to 122ºF)


Inspector: 273 g (9.6 oz.) without battery.


150 x 80 x 30 mm (5.9 x 3.1 x 1.2 in.).


Carrying Case, CE Certification

Limited Warranty

1 year limited, 90 day Warranty on GM Detector