Backlight LCD display To display optical power in mw,dB and dBm simultaneously Absolute and relative power measurement Specification Wavelength650,850nm, 1300nm, 1310nm, 1550nm Measurerange-50dBm ... ) Environment-20+50 45-90%RH Power supply3 AAA 1.5V Dimension82mm(W) x33mm (D) x175mm (H) Weight310g JILONG kl-320 Power Meter