Nucleonic Corp of America DM1D Geiger counter + CDV 700 pickle probe demo
Channel: Josh Lucy
Date: 2016-11-21

This is an old Geiger Counter I refurbished, and was able to find an entire working probe assembly from a CDV-700 on Crag's list.

I added a couple resistors in series: 2.2M and 100K ohms to the cable in order to get the existing 1M ohm resistor in the system up to the required 3.3 M ohms for the G-M tube in the probe.