Function: 1. AC and DC voltage measurement;2. Insulation resistance measurement;3. 100 groups of data storage;4. Automatic calculation of polarization index, absorption ratio;5. Backlight and data retention function;Specification:Size: 172.7 x 140.3 x 62.3mm / 6.8 x 5.5 x 2.5in supply: 8*AA batteries (not included)Maximum display: 2000 countsMeasuring range:1. Measure the output voltageMH12: 50V-1000V, (50V, 100V, 250V, 500V, 1000V,).2. Measure insulation resistance:MH12: 0.1M-10G.Absorption ratio and polarization index standardAbsorption ratio :The ratio of the insulation resistance value at 1 minute to the insulation resistance value at 30 seconds.Polarization index PI:The ratio of the insulation resistance value at 10 minutes to the insulation resistance value at 1 minute, to judge whether the equipment has affected the insulation resistance due to moistureInsulating materials all have the absorption process and polarization process of charge after adding high voltage.The system requires that the polarization index should be measured in the insulation test of the main transformer, cable, motor, etc., and this data can be used to judge the quality of the insulation, quality and aging problems.Material: ABScolour: Red+blackPackage Contents:1 x Digital Megohmmeter1 x english manualOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.