Feature: 1. USER FRIENDLY: The inner upper cover is marked with wiring diagram, so there is no need to worry about not knowing how to connect the wires. 2. HARD BOX: Waterproof and shockproof when the cover is closed, the shell is hard that is resistant to bumps, safer to use. 3. LCD DISPLAY: High definition LCD display screen, clear at a glance, all functions displayed on the same screen, rich color design, looks very comfortable. 4. DATA UPLOAD FUNCTION: You can upload the stored test data to the computer through a USB communication cable. 5. POWER SAVING: This digital megohmmeter will automatically shut down after 15 minutes of power on, saving power. Specification: Item Type: Insulation Resistance Tester Material: ABS Model: ETCR3520B Insulation Resistance Range: 0.005MΩ~20.0TΩ Short Circuit Current: ≥7mA DC: 0V-800V; Accuracy: ±5% rdg ±3v AC: 0V-700V; Accuracy: ±5% rdg ±3v Working Power Supply: Rechargeable lithium battery 6200mAh x 1 (built in) Polarization Index Test: Yes Absorption Ratio Test: Yes Capacitance Test Range: 10nF~200uF; Accuracy ±10% rdg ±10nF Real Time Current Display Test Current Value, Current Display Range: 0.001nA~7.5mA Custom Setting Time: 10-3600s Test Timer: Automatically record test time, timing range: 0s~9999s Upload Function: Upload the stored test data to the computer through a USB communication cable Automatic Shutdown Function: Automatically shut down after 15 minutes of power on Protection Grade: Close the cover IP65, open the cover IP40 Working Environment: -20℃~50℃; 80% rh Storage Environment: -25℃~65℃; 80% rh Insulation Resistance: 50MΩ (1000v) (between the test line and the shell) Suitable Safety: AC 3kV 50Hz 1min (between test circuit and the shell). Package List: 1 x Insulation Resistance Tester1 x Power Plug1 x Adapter1 x USB Data Cable3 x Test Line1 x Test Pen1 x Crocodile Clip1 x Hook1 x Cloth Bag1 x Instructions1 x Accessory