Features: Strong anti-magnetic and anti-jamming function. Full function protection, anti high voltage circuit design. High voltage and short circuit input alarm. Large backlit LCD display, easy to read. Unit symbol display, easy to use. Accurate and reliable, wide test range. Insulation test voltages: DC 250V/500V/1000V, 750V AC Voltage. Specification: Material: Plastic Size: 176x116x63mm/ 6.9x4.6x2.5 in Special function VC60B+ Continuity alarm Less than 30?10? Low battery indication Less than approx.7.5V Data hold ? LCD backlight Approx.10Sec. Function protection ? Input impedance 1M? Sampling rate 3 times/Sec. AC frequency response 50-200Hz Operation mode Manual range Max.display 1999 Package Includes: 1X Digital Insulation Resistance Tester