This instrument adopts low current high-throughput DC voltage converter with energy inductance to change 12V to DC 250V / 500V / 1000V. It uses LCR digital bridge to measure resistance and insulation resistance test. It has many advantages: light weight, wide measuring range, display backlight, test lock, automatic shutdown and other functions. It can also be used to measure electricity with advanced appearance and stable performance. Features: Wide measuring range: up to 2000MΩ 1000V with accuracy (4% reading 2 digits). Large LCD display (90 * 48 mm), with backlight, max. Display "1999". Data lock and automatic power off function. Over-range indicator: "1" display. Low power consumption: less than 300 mW when measured without load. Technical data: Color: Dark Grey Green Material: ABS Output voltage: DC250V / 500V / 1000V, 10% Insulation range: 250V: 0.1MΩ 20 MΩ / 20MΩ 500 MΩ; 500V: 0.1MΩ 50 MΩ / 50MΩ 1000 MΩ; 1000V: 0.1MΩ 100 MΩ / 100MΩ 2000 MΩ Accuracy: (read 4% 2 digits) Short-circuit current: <1,6 mA Median resistance: 250V / 500V: 2MΩ; 1000V: 5MΩ Clamp Position: L&E Voltage test: AC750V; Accuracy: (1% read 6 digits) Input Impedance: 1MΩ Frequency Response: (50200) Hz Clamp Position: ACV and G Display: 90*48mm LCD with backlight Max. Display: "1999" Oversized Display: "1" Measurement Method: A/D Conversion Sampling rate: 3 times/second Operating Temperature: 040C Operating Humidity: 30%85%RH Power Supply: 8*1,5V LR6 Batteries (NOT included); or 12V DC power adapter (NOT included) Product Size: 170 * 120 * 60mm / 6,7 * 4,7 * 2,36in Product Weight: 528 g / 18,65 oz Package Weight: 730g / 25.77oz List of packages: 1 * Insulation Resistance Tester 1 * Pair of 10A test wires 2 * Crocodile Clamps 1 * User Manual (English)!