Pocket size● Accurate measurement ±0.2 dB● With LED lights for dark environment● VFL with 10mW (Only for OPM-22V)● Universal adaptor for FC/SC/ST● Network test, judge signal transmission● Continuous use 60h (only in optical powermeter mode)● Lithium batter y USB-charging/AA Batteries (optional)● Automatic wavelength memory,7 wavelengths 850/980/1310/1490/1550/1625nm