UT520 series can perform precise 3-wire and simple 2-wire earth resistance measurement for power and electrical systems, lightning protection equipment, and ground system of all electrical equipment. This series is introductory earth resistance tester with high economic value. Its lightweight design is convenient for fieldwork.Features:1. Over range indication, test lead connection alarm2. TEST button for fast capture of measurement values3. 20-group data storage/recall4. Backlight5. Data hold6. Auto power off/battery check7. Earth voltage measurementSpecificationsRangeAccuracyModelUT521Earth Resistance ()~20(2%+10)~200(2%+3)0~2000(2%+3)AC Earth Resistance (V)0~200V(1%+4)Frequency: 50Hz/60HzyesFeaturesDisplay Count2000Manual RangeyesAuto Power OffAbout 10 minutesyesLow Battery IndicationyesData HoldyesData Storage20LCD BacklightyesFull Icon DisplayyesDouble Insulation ProtectionyesContact Badness IndicationPort C or Port E don't contact display"---"yesOverload IndicationDisplay "OL"yesSimple 2-Wire TestingyesPrecision 3-Wire TestingyesGeneral CharacteristicsPower1.5V AA Batteries * 6(not included)LCD Size70.6*34mm/2.8*1.3inProduct ColorRed and greyProduct Net Weight560gProduct Size160*100*70.5mm/6.3*3.9*2.8inStandard Carton Gross WeightApprox.2112g/74.5ozPackage list:1 * UT521 Earth Tester(battery not included)2 * Auxiliary Ground Nails1 * Protect Shell1 * Cloth Pouch2 * Crocodile Clip Test Lead (green + red)3 * Standard Test Lead with Clip(green + yellow + red)1 * Instruction .