SINOTIMER SDM008 Rail Type AC Multifunctional Digital Voltage And Current Power Monitor1. Basic current: 100A2. Reference voltage: 50-300V3. Frequency: 5060Hz4. Display mode: digital display5. Parameters:- Voltage: measuring range: AC50-300V; starting voltage: 50V; measuring accuracy: +- 1 percent- Current: measuring range: 0.02-100A; starting current: 0.02A; measuring accuracy: +-1 percent- Active power: measuring range: 0.5-30kW; starting current: 0.5W; measuring accuracy: +-1 percent- Power: measuring range: 0-1999kWh; overflow hold, unless it is considered to be cleared to zero; measuring accuracy: +-1 percent6. Dimensions: 78 x 34 x 65mmFunction:1. Measurement of AC voltage, current, active power, electricity and display through the LCD liquid crystal screen2. Backlight control: short press the key to turn on or off the backlight3. Power zeroing: press and hold the key for more than 3 seconds until the power flashes, release the key and press it again to zero the power, otherwise it will stop flashing after 3 seconds and not zero the power4. Data saving: power, backlight status can be saved after power failure