... 1 Multi-wavelength precise measurement2.2 Absolute power measurement of dBm or xW 2.3 Relative power measurement of ... dB2.4 Auto off function 2.5 270, 330 ... , 1K, 2KHz frequency light identification and indication 2.6 Low voltage indication2.7 Applicable to versatile ... adapters (FC, ST, SC, LC)2.8 Handheld, large LCD backlight display, easy-to ...