With this device tester you can carry out quick and comfortable independant tests according to DIN VDE 0701-0702 (DGUV regulation 3, BGV A3). With this battery-operated device tester, you can carry out the basic test, such as protective conductor resistance, insulation resistance and replacement leakage current, even without mains voltage. Pre-defined test sequences make it easier for the tester to select the test sequence, and this allows quick assignment of the test samples according to SK I or SK II. There is also a test procedure for extension cables and line rollers, so that these test pieces that occur very frequently in practice can be tested very quickly and easily.In addition, the device tester PAT150 can also carry out measurements of the earth conductor current and the contact current with mains voltage in order to be able to measure test samples with electronic switches safely. If the device tester PAT150 is supplied with mains voltage, instead of the replacement leakage cu