Transistor measuring instruments of insulation resistance PU 370, PU 371:

Transistor measuring instruments of insulation resistance PU 370 (100V) and PU 371 (500V) are used for resistance measuring, for both outdoor and cable networks of AC and DC electric installations.
Measuring voltage of 100V is used for insulation resistance measuring in electrical equipment and telephone networks with working voltage of 100 V. Measuring voltage of 500V is used in electrical equipment for insulation resistance measuring.

Testers of accumulator batteries - ZB 2, ZB 12 and ZB 16 :

Battery testers are used for the control of accumulator batteries with nominal terminal voltage of 6 - 12 V.
Tester ZB 2 - is used for the control of the lead accumulator battery cells condition.
Tester ZB 12 - is used for the control of accumulator batteries with terminal voltage of 12 V and with current capacity in the range from 35 to 120 Ah.
Tester ZB 16 - is used for the control of accumulator batteries with nominal terminal voltage of 12 V and with current capacity in the range from 35 Ah to 125 Ah. In the above mentioned way we can quickly find out the approximate terminal voltage of the starting accumulator batteries with loading.

When disconnecting the loading resistance we can measure the battery voltage up to the value of 16 V without loading. Both the tester and the measured accumulator battery need not to have the corresponding polarity for that measuring.