Rare training stuff... Not too much info about it. Used in tanks and helicopters as well.

Cooperation with AIP-68. The automatic AIP-68 signal imitator controls the  signaling roentgenometer readings on the three measurement sub-ranges x1, x10 and x100. The impulses are generated at the output of the imitator on one or two first probes of the roentgenometer. The automatic imitator is in standby mode. Every program you are trying. For ground simulation of contamination from programs I to IV. Programs V and VI for air-conditioning simulation of contamination.

Do not have any cables to it. I should have ends that fits AIP but have no idea if it will work with any other counter where You can unplug the probe cable..

Generally it was made for DPS68.