2. AUTOMATIC COMPARISON: The ground resistance tester can automatically calculate the DAR absorption ratio of the DAR measurement, the ratio of the insulation resistance value at 1 minute to the insulation resistance value at , and determine whether the equipment affect the insulation resistance due to humidity 3. ACCURATE AND POWERFUL: High accuracy megrohm meter, insulation resistance tester can be used for AC and DC voltage measurement, insulation resistance measurement, support 1100 sets of data storage, automatic calculation of polarization index and absorption ratio 4. WITH BACKLIGHT AND SUPPORT FRAME: The digital display back light screen allow you to see the screen value in dim environment, the back has 45° extendable support frame, so that the megohm meter is convenient to stand operation 1. PI MEASUREMENT AND AGING IDENTIFICATION: The power system requires insulation resistance tester to measure the polarization index in the insulation test of the main transformer, cable, motor, etc., to judge the quality of the insulation condition, quality and aging problems 5. MULTI LEVEL HIGH VOLTAGE OUTPUT: Connect the insulation resistance measuring pen to both ends of the test appliance, select the output voltage, press the TEST button automatically discharge to measure whether the appliance is normal or short circuit, Weight: 4.40924524 Pounds, Manufacturer: Gishbjka