Power Supply: AC Display Type: Digital Only : ELECTRICAL Product name: Three-phase embedded electrical parameter measurement module Voltage range: 3*220/380V three-phase four-wire system Signal processing: Using dedicated metering chip 24-bit AD Power supply: DC 3.3/DC 5-24 (optional) Current range: 50A Interface type: 1 channel -485 communication interface, 1 channel TTL interface (3.3V) Protocol: MODBUS-RTU protocol Data Format: Software can set "n,8,1", "e,8,1", "o,8,1", "n,8,2" Temperature drift: less than equal 100ppm/ Colour:green+black Material:PCB+electronic components Package Contents: 1 x AC acquisition module 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.