Polish DKP-50 Personal Dosimeter pen, designed for use by military personnel and nuclear workers, the pen when held to a light-source displays an absorbed amount of ionizing radiation in Roentgens from 0-50.
The pen can be reset using a DP-66 Geiger counter by inserting the pen into the charging port and using the zeroing dial to reset the pen to 0 Roentgen.
A cool bit of Communist hardware, there is a very similar DKP-50A used by the Soviet Union, this dosimeter only records gamma and x-rays that penetrate the device.
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