Description SCM and so on, prepare the cable and write the by yourself. the specification of the PZEM-004T AC communication module, the module is mainly used for measuring AC voltage, current, active power, frequency, power factor and active energy, the module is without display function, the data is read through the TTL interface. PZEM-004T-10A: Measuring Range 10A (Built-in Shunt) PZEM-004T-100A: Measuring Range 100A (external transformer) : Electrical Measuring Energy Range: 100A/22000W Rated Voltage: 220V Power Supply: AC Display Type: Digital Only Output Voltage: 220V Dimensions: 7.8cm*3.7cm Model Number: PZEM-004T Phase: Single Phase Operating Temperature: -10-60degree Accuracy Class: 1.0 Max Operating Current: 100A - 119A Accessory: Coil CT Communicate Port: TTL Current range: 0-100A Voltage range: 80-260V Power range: 0-22kw Power factor: 0-1 Frequency: 45-65Hz Protocol: Modbus colour:Blue + black Material:plastic Package Contents: 1 * PZEM-004T AC Voltmeter Ammeter with outcase 1 * Coil CT Only the above package content, other products are not included. Note: Light 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.