1. Mainly used for measuring AC voltage, current, active power, frequency, power factor and active power. 2. The module does not have display function, the data is read through the TTL interface. 3. Power overrun alarm: active power threshold can be set, when the measured active power exceeds the set threshold, the alarm state is set. 4. Common to systems, high , fast response, stable communication. 5. Adopting UART to TTL communication interface, power clearing function, and there is a row of pins design, easy to use. Specifications: A: 100A unit + open-close CT32A Color: As Shown Material: Plastic+Metal Package Contents: 1set * 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.