The Clamp Ring Is Removable And Suitable For 3-Phase 4-Wire American Business And European Homes), Single-Phase Three-Wire (American Homes), And Single-Phase Two-Wire (European Homes) The Three Main Clamping Rings And The Two Auxiliary Clamping Rings Support Bidirectional Measurement. If The Clamping Ring Is Reversed, The Power Will Be Negative. If The Secondary Clamping Ring Is Measured In The Opposite Direction, The Phase Needs To Be Manually Set By The App. In Other Cases, It Will Be Automatically Recognized (Reminder Will Be Added In The Subsequent App); Multi-Channel Measurement. Simultaneously Measure Solar Energy And Grid Electricity Consumption, And Can Also Measure Electrical Appliances Separately. Support Hour, Day, And Month Dimension Viewing, As Well As The Option To Compare Consumed And Generated Energy Data Current, Active Power, Voltage, Frequency, Power Factor And Other Real-Time Data. Active Power And Current Real-Time Data Of The Auxiliary Clamp Ring Support Tuya'S Linkage And Tuya'S Low-Carbon Energy Saving, Which Is Now Charged), Such As Grid Output, Solar Energy Generation The Main Card Will Support 80a And 120a In The Future. Rail-Type Wall Hanging, Can Be Mounted On The Wall Or On The Rail. Description: 1.Type: Digital Voltage Measuring Instrument 2. Measuring Range: 90V-380V 3. Voltage Measurement Error: 2% 4. Input Voltage: 90V-380V Material: ABS colour: As shown Package Contents: 1 x Main Unit 3 x 200A Main CTs (3.5mm Audio Plug) 2 x 50A Sub CTs(2.5mm Audio Plug) 1 x External Antenna 1 x Power Cable 1 x Mounting Nracket / 1 x Main Unit 3 x 300A Main CTs (3.5mm Audio Plug) 2 x 50A Sub CTs(2.5mm Audio Plug) 1 x External Antenna 1 x Power Cable 1 x Mounting Nracket 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.