Introduction 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 UNI-T’s introductory earth resistance tester with high economic value. Its lightweight design is convenient for fieldwork. Specification Model： UT522 Earth Resistance (Ω) 0～40Ω: ±(2%+20) 0～400Ω: ±(2%+3) 0～4000Ω: ±(2%+3) 0～400V： ±(1%+6) Frequency: 50Hz/60Hz Features Display Count： 4000 Manual Range： √ Auto Power Off： About 10 minutes Low Battery Indication： √ Data Hold： √ Data Storage： 20 LCD Backlight： √ Full Icon Display： √ Double Insulation Protection： √ Contact Badness Indication: Port C or Port E don’t contact display”---Ω” Overload Indication： Display “OL” Simple 2-Wire Testing： √ Precision 3-Wire Testing： √ General Characteristics Power： 1.5V Batteries (5#) X 6 LCD Size: 70.6mm X 34mm Product Color: Red and grey Product Net Weight: 560g Product Size: 160mm X 100mm X 70.5mm Accessories Batteries, Carrying bag, Simple test lead, Test probe, Gift box, Manual