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 Power supply: DC5V/DC12V optional (current consumption is less than 50mA) Select a suitable range, if the range is too much, the small resistance cannot be recognized or the measurement is inaccurate The resistance meter cannot be measured with electricity, otherwise the meter be burnt out 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: 0.661386786 Pounds, Manufacturer: Uxsjakjsd