Specifications: Function: used to measure the conductor resistance of cables, the contact resistance of switches, connectors and relays, the DC resistance of coils, motors and transformer windings, and the connection resistance of connecting conductors between metal components, metal riveting and grounding grids. Power supply: DC 7.4V 2000mAh lithium battery Power: measured power ≤ 17.64W, working current ≤ 1.2A Detection mode: precision four wire method, 2-way A/D simultaneous detection Measuring range: 1m Ω~20.0k Ω Test interface: C1 current positive, C2 current negative, P1 voltage positive, P2 voltage negative Measurement time: 2 seconds/time Data storage: Yes, data will not be lost if power is lost or battery is replaced (200 sets) Test indication: blue TESTING light flashes during test Test line: two groups: one group for red and one group for black, 0.8m long Backlight function: Yes, suitable for dark places Display mode: display field: 58. 5mm X 46mm Host size: 159mm X 100mm X 66mm Weight: instrument: about 460g (including battery); Total mass: about 640g (including accessories) Line voltage: it should be avoided (the line cannot be measured live, which may damage the instrument) Overflow display: Overrange overflow function: "OL" symbol display Low voltage indication: when the battery voltage drops to 6.5V ± 0.3V, remind to replace the battery in time. Operating temperature and humidity: - 10 ° C~40 ° C; Below 80% rh Storage temperature and humidity: - 10C~60C; Below 70% rh Withstand voltage: AC 3700V/rms (between shell and screw) Applicable safety regulations: IEC61010-1, CAT III 600V, pollution level 2, JJG724-1991 Verification Regulation of DC Digital Ohmmeter, JJG166 - 1993 Verification Regulation of DC Resistors, DL/T967-2005 Verification Regulation of Loop Resistance Tester and DC Resistance Fast Tester