Inspector Alert Geiger Counter


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2.00 LBS
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inspdisplaytn.jpgThe Inspector Alert v2, by International Medcom, among the most sensitive pocket Geiger counter available, offers a digital readout on a crisp, clear, easy-to-read LCD display, as shown in these pictures.  The readout is displayed also with a red count light and audible beep (play this sound file), providing instant indications of the radiation level.


inspwindowtn.jpgThis model is also built around a very large , pancake-style Geiger-Mueller tube, with a diameter of 45 mm (1.75 in), increasing the efficiency of radioactivity detection, and offering excellent sensitivity to low levels of Alpha and Beta, in addition to normal Gamma and X-ray detection.   See picture at left.  This feature makes the Inspector suitable for applications requiring higher levels of sensitivity such as checking food for radioactive contamination, subject to certain qualifications - click on the link.

The  Inspector Alert is in part named for its user-settable Audible Alert.  You can see the controls on the top panel of the unit (right).insptoptn.jpg

When the Mode switch on the front of the instrument is set to Total/Timer, you can engage an adjustable timer to set sampling periods of 1 minute, 10 minutes, or 1 hour, up to 24 hours.  See the photo at left.  This is an especially useful feature for establishing a background count, or for low level radiation detection.insppaneltn.jpg

This unit also has an output port to record counts on a computer or data logger, as shown in the picture below.  Select the navigation button above or click on this link for more on Data Output and Software.  inspportstn.jpgThis port can alternatively be used for audio output through earphones.  An external Calibration Input port is also located on the side of the instrument.


The Inspector Alert also comes with a padded nylon carrying case (left) with belt loop.radcasetn.jpg

The Inspector Alert also comes with perhaps the best Operation Manual of any Geiger counter in our selection - in printed, booklet form, and very user friendly and thorough.


inspmanualtn.jpgThe Inspector Alert is among the most popular Geiger counter within our selection.  If you want a Pocket Geiger Counter with ultra sensitivity, user-adjustable audible alert, a timer and/or data port, and prefer a digital readout versus an analog meter, we recommend this unit.

This item typically ships out within 1 business day.

Specifications for the Inspector Alert:


Halogen-quenched, uncompensated Geiger-Mueller tube with thin mica window

Window Size

1.4 to 2.0 mg/cm² thick; diameter is 45 mm (1.75”)

Radiation Detected Alpha, Beta, Gamma, X-ray
Sensitivity Detects alpha down to 2.5 MeV; efficiency at 3.6 MeV > 80%
Detects beta at 50 keV w/35% efficiency, at 150 keV w/75%

Detects gamma and X rays down to 10 keV thru window, 40 keV minimum through case; gamma sensitivity is 3,500 CPM/mR/hr


15% of full scale, referenced to Cs-137

Operating Ranges

.001 to 100 mR/hr, .01 to 1000 µSv/hr, and 0 to 350,000 CPM, 0 to 5,000 CPS, Total Counts from 1 to 9,999,000

Display 4-digit liquid crystal display with mode indicators; updates every 3     seconds
Alert User-adjustable alert level for mR/hr and CPM is set using three buttons - default is 100 CPM


Electronic calibration at factory to NBS standard Cesium 137 gamma source


Holds full scale in fields as high as 100X max. reading

Power Required

One 9-volt alkaline battery (included in price of unit)

Battery Life

Up to 2,160 hours use at normal background levels, or 625 hours at 1 mR/hr with beeper off

Temperature Range

-10° to + 50° C (14° to + 122° F)


340 grams (12 oz.) with battery


150 x 80 x 30 mm (5.9 x 3.2 x 1.2 in.)


LED indicator, internally mounted audible beeper for count rate, can be switched off for silent operation

Input Port Calibrate port on side for electronic calibration w/pulse generator
Output Port Dual miniature jack on side to drive a CMOS or TTL interface to record counts on computer, data logger, or accumulating counter
Audio Port The Data Port can alternatively be used as an Audio Port, using an earphone with a 3.5mm stereo plug
Options Wipe test plate, Software and Data Cable
Warranty 2 years on instrument, 1 year on GM tube, includes CE mark

Country of Make


Click on this link for the:

Inspector Alert Operating Manual

6 Reviews Hide Reviews Show Reviews

  • 5
    IMI Inspector Alert IA- V2

    Posted by Enrico on Jan 2nd 2021

    Completely satisfied with the quality of IMI Inspector Alert IA-V2 and with the delivery times (US-Europe transport). I notice that the device does not work with a 9V battery, as indicated in the specifications on this site, but with a 1.5V alkaline battery. It is a better choice.

  • 5
    Save me from drinking radioactive milk.

    Posted by Dorothy A Thomas on Jul 1st 2019

    When first got my geiger counter I was still using my old one. It was losing its accuracy. I had been very lucky so far with milk because it comes from local dairies. I run a BnB and sometimes they leave food. Last time they left lactose free milk. I was intrigued and wanted to try it. I took a geiger counter reading off of it. It was over a hundred siverts! I did not drink the milk.

  • 5
    works as advertized

    Posted by louis on Jun 10th 2018

    very handy and easy to operate

  • 5
    Reliable and Easy to Undestand

    Posted by William O. Robertson / AI4QT on Apr 30th 2018

    One of the best Geiger counters to understand how to operate. The "pancake" style sensor is worth the extra price in having. A true workhorse.

  • 5
    Accurate and easy to operate.

    Posted by William O. Robertson on Apr 6th 2018

    No complicated menus to decipher in learning to operate this Geiger counter. I like the fact it has a "pancake" style sensor for more accurate readings. I purchased form No problems with shipping and delivery. Quality product. Recommended.

  • 5
    IMI Inspector Alert

    Posted by Gregory Iversen on Oct 6th 2017

    Truly the "gold standard" of mid-range Geiger counters. A wealth of options for hobbyists and mid-level pros alike. A quality instrument well worth its price. Be sure to purchase the Extreme Boot to protect the pancake GM tube. Good quality regular belt case may come free with unit. NOTE!!! Pg. 12 of my manual, under "The Utility Menu" tells you "To activate the Utility Menu, hold down the + button on the end panel while you turn on the IMI Inspector Alert." SHOULD READ ..." Hold down the + and - buttons on the end panel while you turn on the IMI Inspector Alert!" Happy nuclides!!!