Technical parameters: Working power supply voltage: AC165-275V; Power consumption: MAX3W; Operating environment temperature: -20~65Celsius; Storage environment temperature: -40~85Celsius; Protection level: IP54 (front panel after installation) External dimensions: 100MM x 100MM x 77MM Opening size: 91MM x 91MM; Weight: 320G Colour:black Material:plastic Package Contents: 1 x Digital Multi‑Functional Meter 1 x Installation Kit (4pcs) 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. 4. Package including one meter and installation kit, which can provide much convenience for your mounting. 5. Made of high qualiy material of plastic, which makes it and have high reliability. 3. With switch off and alarm indication functions, as well as over‑frequency, over‑voltage and over‑current alarms, so that users can judge the occurrence of faults. 2. Multi‑function meter, used for three‑phase generator, can check voltage and current, it also has automatic protection and alarm function. 1. It is a three‑phase meter, supports a variety of numerical measurement, voltage, line voltage, current, frequency, multi‑function monitoring instrument.