Features: Multifunctional for measuring the trip current, trip time, loop resistance of switch leakage, and the voltage, frequency of on-line voltage, RCD(earth leakage switch), AUTORAMP(triggered current). Functional features of the measurement of jump-off current, jump-off time, contact voltage, loop resistance. Up to 1000 sets of test results can be stored, convenient for further inquiry. Data stored in the can be uploaded to a PC via the USB 2.0 interface. The portable resistance tester is easy to use and has stable performance. 4.7-inch LCD screen with backlight for conveniently checking the test in the low lit condition. with low battery indication. Perfect for the electricians to do testing, inspection, and repairing. Specifications: Material: ABS Color: black+red AC Phase: Voltage Measurement: 0~440V Frequency Measurement: DC, 45~65Hz Test Current Magnification: 0.5, 1, and 5 Fast/Slow Current Test Gears: 10, 30, 100, 300, 500mA Safety Level: III 1000V, IV 600 Max. Common Mode Voltage: 600V AC Display Type: LCD display Range : Fully automatic range Frequency Detection: Automatic Over-range Display: " " Power Consumption: 100mW Operating Temperature & Altitude: 0~40, 2000m Storage Temperature & Altitude: -20~70, 12000m Power Supply: 8 x 1.5V AA battery (NOT included) Item Size: 190 x 140 x 68mm / 7.48 x 5.51 x 2.68in Package Contents: 1 x Tester 1 x Test Lead 3 x Clip 1 x USB Cable 1 x CD 1 x Storage Case 1 x English Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.