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 host can be uploaded to a PC via the USB 2.0 interface. The compact portable resistance tester is easy to use and has stable performance. 4.7-inch LCD screen with backlight for conveniently checking the test result 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 RMS Display Type: LCD display Range Selection: Fully automatic range Frequency Detection: Automatic Over-range Display: " symbol" 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.