This Senter ST805C Optical PON Power Meter is easy to operate, with full touch screen operation. It supports APON / BPON / GPON / EPON. It can perform ±0.5dB uncertainty, 3 wavelength PON power system 1310nm / 1490nm / 1550nm, specific design for network construction and maintenance, and in-service testing. Moreover, it has all PON network signals, threshold value setting, data storage, auto backlight off function, 1000mAh rechargeable lithium battery.