Mine tester is a portable device issued by the St. Petersburg firm "K. Lorenz", to measure resistance, electrical and blasting the network when setting underwater min. the Device is a wooden case with a hinged lid, under which is placed a steel Board with the regulation and the scale readings. At the end of the device, there are two clips with the words "lived" and "armor". The scale shows the impedance in ohms. The steel cap is missing a few bolts. On the cover there is a steel shield with the name of manufacturer and year of production. Performance was not tested.Good preservation.Size: 25х20х16 see the Original.