A highly sensitive, end window Geiger - Muller tube that operates on 450 volts which is supplied by the counter-timer.
The high speed of the counter-timer allows any pulse rate that the tube can receive to be accurately counted. The
pulses may be monitored using a speaker and an amplifier or they may be displayed on an oscilloscope.
Easy to use. Plug the tube into the counter, turn the counter on, and start measuring