There are 4 kinds of standards, 300V with built-in CT/300V with external CT/450V with built-in CT/450V with external CT optional. Voltage: 40-300V/250-450V, Current: 0-100A, Active Power: 0-30000W, Power: 0-99999kWh, Frequency: 45-65Hz, Power factor: 0-1PF. Color LCD display with backlight function, this single-phase energy meter is clearly visible no matter day or night. This home electricity consumption monitor adopts high-quality ABS flame retardant material and high-precision chip, which is safe to use and has high precision. This Kwh meter is easy to install and can be used indoors or outdoors. Widely used in home, school, market, industry, laboratory, etc. Specifications: Material: ABS Dimensions: 54x80x64mm/2.1x3.15x2.5in Style: 300V Internal CT/300V External CT450V Internal CT/450V External CT (Optional) AC Voltage: AC 80.0-300.0V / 300.0-450.0V (depending on the range you choose) AC current: AC 0-99.99A, minimum resolution is 0.01A Power frequency: 45.0Hz-65.0Hz Power factor: 0.00- 1.00PF Active power: 0-45000W When the active power is between 0-9999.9W, the display accuracy is 0.1W Electric energy: 0-999999kwh, when the electric power is between 0-999.99 When it is between kwh, the display precision is 0.01kwh, when it is between 10000.0-9999.9kwh, the display precision is 0.1kwh, and when it is between 10000.0 and 999999kwh, the display precision is 1kwh. Speed: 2 times per second Installation Size: 35mm Din Rail Installation Note: Please allow 1-3cm error due to manual measurement. Make sure you don& 39;t mind before bidding. Due to differences between different monitors, the pictures may not reflect the actual color of the item. Package includes: 1X Energy Meter