The DP-66 was the work-horse of the Soviet aligned Warsaw pact nations for nuclear and radioactive testing and calibration. Similar to the US Military issued Geiger counters in function, the DP-66 has the features and robust construction only found on Soviet-era military hardware.
Mine arrived complete and functioning, was painted until 2000 according to the enclosed logbook. Just needed to add 2 D batteries. There are translations of the operators manual available on the internet. Very happy with this purchase. It did have kind of a funky odor, it is living in the garage.