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An additional device for testing transistors "P-222" from 1973 produced Omsk plant Elektrotochpribor. The device is designed to measure the health and parameters of direct and reverse conduction transistors in conjunction with a combined "Ts-20" type device. The disadvantage of the device is a change in the polarity of the battery when checking transistors of different conductivity. Hams put the battery polarity switch between the handles of the device.