This ohmmeter is a common ground instrument, non-isolated, it is recommended to use a separate power supply, that is, the power supply is not related to the signal The resistance meter cannot be measured with electricity, otherwise the meter be burnt out Select a suitable range, if the range is much, the small resistance cannot be recognized or the measurement is inaccurate Power supply: DC5V/DC24v optional (current consumption is less than 50mA) The meter head is a common ground instrument (that is, the negative pole of the power supply and the negative pole of the signal are connected), it is recommended to use a separate, , and isolated power supply (that is, the power supply and the measurement terminal are not related), Weight: 0.10582188576 pounds, Manufacturer: rirue