TP-18 slim optical scanning probe is designed and manufactured by Tespro China. TP-18 is designed for simoutanous meter active and reactive accuracy testing. TP-18 can sense both light and infrared light pulses emitted by LED, then convert them into electric pulses. It is designed with slim dimension of 10mm and high optical sensitivity. TP-18 can adapt to various calibration equipment, including high-precision standard meters produced by EMH, meter production testing equipment from major meter manufacturers, and portable on-site testing equipment.