The 90-12 is a rugged, lightweight, energy compensated, general purpose Geiger Mueller (GM) tube based hand held probe, with beta shields. These probes are designed to fulfill a  variety of radiation measurement needs. The adjustable beta shield is a 360-degree shield with a linear movement to permit discrimination between penetrating and non-penetrating

radiation. The two windows expose an angle of 180 degrees total in the most sensitive area of the GM tube. With the shield open the probes measure beta, x-rays, and gamma rays. With the beta shield closed the probes measure penetrating x-rays and gamma rays. The GM probes are available with MHV connectors.

We have the Victoreen program modules that store the calibration information to allow rapid swapping of detectors on a Victoreen Model 190 meter as a separate item.