HD Color LCD Screen: This AC voltmeter-ammeter offers 360° vision with no blind spots and features a backlight for clear visibility day or night. 6-in-1 Multimeter: This digital power meter simultaneously displays 6 data points: AC voltage (50.0-300.0V), AC current (0.0-99.99A), power factor (0.00-1.00PF), active power (0-30,000W), electrical energy (0-99999 kWh), and frequency (45.0-65.0Hz). Automatic Save & Reset Function: The energy value is automatically saved when power is off and resumes accumulation upon next power-on. To reset the energy value to zero, press and hold the reset button (located at the bottom right) for 4 seconds with a needle. Wide Application: This versatile volt-ampere power monitor is easy to install in a panel, making it ideal for power measurement systems, schools, markets, household appliances, industrial settings, laboratories, and more. Safe & High Precision: Constructed from high-quality flame-retardant ABS material and a high-precision chip, this single-phase digital meter ensures safe operation and high accuracy. Note: This digital energy meter is designed for measuring 50/60 Hz AC current in urban environments only. It may be damaged when measuring square waves, inverter outputs, or non-standard sine waves. Package Includes: 1 Electricity Meter Size: 49*47*53mm Measurement Accuracy: 1% ± 2 words Measurement Range: AC Voltage: 50.0-300.0 VAC (or 250.0-450.0 VAC) AC Current: AC0-99.99A (Resolution 0.01A; displays 100.0A when exceeding 100A) Power Frequency: 45.0 Hz to 65.0 Hz Minimum Display Resolution: 0.1 kWh Minimum Resolution: 1 kWh Hole Size: Φ22mm diameter Note: Actual color may vary due to different display settings. Manual measurements may have errors (1-2 cm).