Features: Electrical parameter measurement function (voltage, current, active power, energy). Current alarm threshold preset function, can set its own current alarm threshold. Current alarm threshold preset function, data storage when power off. 20A and 100A are two different products that are selectable, not universal. Large LCD screen with full display of voltage, current, active power, energy. Backlight allows you to see the dates clearly even in dark areas. Specifications: 2 models selectable: 20A / 100A Operating voltage: 110 ~ 250VAC Rated power: 20A / 5000W (20A) (standard 4400W)! 100A / 22000W (100A) Working frequency: 50 / 60Hz Frequency measurement range: 45 ~ 65Hz Power measurement range: 0.01W ~ 4500W Energy measurement range: 0.01Wh ~ 99999kWh Voltage measurement range: AC 50V ~ 300V Current measurement range: 0.01 ~ 20A Voltage accuracy: ± 1% Current accuracy: ± 2% Power accuracy: ± 2% Panel size: 90 * 54.5mm / 3.54 * 2.15in Product size: 85 * 47 * 28mm / 3.35 * 1.85 * 1.10in Package size: 100 * 80 * 30mm / 3.94 * 3.15 * 1.18in Product weight: 67g / 2.36oz Package weight: 110g / 3.88oz Notes: 1. The total power of resistive load of connected appliances must not exceed the rated power, otherwise it will be damaged, even fire. 2. 20A power meter is built-in shunt, if it does not display power supply and power factor, it means that the wiring connection is wrong, please check the wiring diagram. 3. In addition to cables, no other objects should be inserted into the connection hole; tighten the screws. 4. No waterproof function, only used in dry indoor environment. 5. Keep away from children and fire. Package List: 1 * Power Meter 1 * Power Meter