It's another, exclusive, one-off Special from anythingradioactive. This is one of a number of prototypes that we commissioned a while back, when we were casting around for replacements for our in-house designed GeigerActiv models. This one had some of the features that we were looking for, but what we really wanted was a fully self-contained, pocket size instrument. As you can see the main unit fits the bill, but it came with a huge probe containing a J306B tube, so it never made the cut.
The large tube means increased sensitivity (Beta and Gamma) and that’s putting it mildly; it typically registers between 150 and 250 counts per minute (cpm) of background radiation (your mileage may vary according to local conditions). The backlit LCD display can also be set to show MicroSieverts per hour - in fact there are four operational modes, selected by the tiny black button on the front panel.
  • Mode 1: continuous and accumulated dose rates in MicroSieverts
  • Mode 2: as above with an ‘event’ beep
  • Mode 3: continuous CPM and MicroSieverts
  • Mode 4: as above with ‘event’ bleep
The probe is connected to the display unit by a 1.4 metre cable, terminated at both ends with BNC connectors, so other probes requiring a 450 – 500 volt supply can also be used.
It is powered by an AA-sized rechargeable battery and recharged using a standard Micro USB lead and mains adaptor. A red LED indicator shows charging in progress and the outfit comes with a mains charger/adaptor and cable. It was a costly exercise for us but our loss could be your gain and on its own the GM tube it uses sells for almost as much as the whole outfit – so be quick. You won’t see another one like it, and definitely not at this price!

Here's the numbers:
Main unit 
Display: LCD showing Mode, uSV/h, CPM & battery state
Power: 1 x AX 14500 3.7 volt, 1200mA Lithium-ion cell
Supplied accessories: rechargeable battery, mains charger and USB cable
Main unit
Dimensions: 135 x 80 x 25mm
Weight: 151g
Dimensions: 244 x 25mm
Weight: 65g

Please note that this is a prototype so it's somewhat lacking in the cosmetics department. However it has been professionally built to a high standard and is in full working order. It has had very little use and is in virtually as-new condition. It doesn't come with instructions but since there are only two controls (the on/off switch and Mode button) it is exceptionally easy to use.

Postage to non-UK addresses is via tracked/insured air mail.

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Prototype Geiger Counter with HUGE J306B Geiger Tube

  • Product Code: Prototype Geiger Counter
  • Availability: In Stock
  • £85.00