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Inspector Alert Geiger Counter

2.00 LBS
  • Product Description

    The IMI 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.




    This 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 right.  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 above 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 (see photo).

    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 above.   This is an especially useful feature for establishing a background count, or for  low level radiation detection.

    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.   This 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 (right) with belt loop.  Scroll down for detailed Specifications on the Inspector Alert.

    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.


    The 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


  • Product Reviews


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    1. Perfect international service

      Ordered 4 counters from switzerland for our school. very good service. Fast international delivery (only days). In addition to that, the person in charge noticed from my mail address that the delivery went to our school, although I ordered with my personal credit card and to my private address for technical reasons. Good job! on Nov 24th 2020

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