British Military Meter, Contamination, No. 1 (Early Cold War Geiger Counter)

Description

Very Rare British Military Meter, Contamination, No. 1 (Early Cold War Geiger Counter).
Meter, Contamination, No. 1
The first large scale British civil defence issue was the Geiger–Müller counter
Meter, Contamination, No. 1
set, of 1953.
It had 0–10 mR/hour range with external probe. This was designed to use two 1.50 volt batteries, although later they were fitted with an inverter which used four 1.35 volt mercury cells or, alternatively, a mains electricity power pack. Many of these units remained in service until the 1980s.
This used cold-cathode
valves
and very high impedance circuitry throughout to extend useful battery life as long as possible with the existing technology.
Batteries for this unit are no long available, does power on with external power supply but sold for display only
Condition is Used. Shipped with USPS Priority Mail.