Features: An for ideal tool for electric equipment maintenance, testing and inspection. This insulation resistance tester can measure insulation resistance, AC voltage, etc. High degree of accuracy, stable performance, easy operation and reliability. Support automatic measurement, low battery indication, LCD backlight, alarm light display, alarm buzzer. Widely used for insulation resistance measurement, such as transformer, electric machines, cables, switches, electrical appliances. Specifications: Material: ABS Size: approx 15x10x7.1cm/5.9x3.9x2.8in Insulation Resistance Measurement Rated Voltage: 100V 250V 500V 1000V Test Range: 0.00MΩ~5.5GΩ （When It is about less than 4.0MΩ, buzzer outputs alarming sounds. ) Note: (100V)0.00MΩ~100MΩ Opened Voltage: for DC 100V±10% for DC 250V±10% for DC 500V±10% for DC 1000V±10% Rated Test Current: When load is 100KΩ, the rated testing current is 0.9mA ~1.1mA. When load is 250KΩ, the rated testing current is 0.9mA ~1.1mA. When load is 500KΩ, the rated testing current is 0.9mA ~1.1mA. When load is 1MΩ, the rated testing current is 0.9mA ~1.1mA. Shorted Current About less than 1.8mA. Accuracy: 0.00MΩ~99MΩ: (3%+5digits; 100M ~5.5GΩ: ±（5%+5digits） Voltage Measurement AC Voltage Test Range: 30V~750V(50Hz/60Hz) Resolution: 1V Accuracy ±（2%+3digits） Package Includes: 1X Ground Earth Tester note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.