a. Transform the measured 1-phase AC current into the standard DC voltage and DC current output ,according to the linear proportion b. Excellent anti-interference ability and high accuracy (1%) c. Sensors are widely applied to all kinds of industrial current online detection system Return & Refund 1.Buyer can refund and get refund in 30 days after receipt,if there's quality problem in original product. 2.24 Months Guarantee.Buyer and Seller bear each shipping cost in exchange procedure.