TP-17C is the third generation model of TP-17 series scanning optical probe. It is a duplex-function model, and can be applied to mechanical meters or electric meters in their accuracy testing. By integrating with TP-GS bracket the combined TP-17C set can be a perfect accessory for on- site test instrument or for test bench. TP-17C optical scanning probe can sense both light and IR(Infrared) light pulses emitted by LED of electric meters, and then convert them to electric pulses. And TP-17C can also sense rotate mark on mechanical meter.