Features EASY WORKING This optical cable tester adopts sensitive chip and sturdy internal structure, just plug and play, also ensures a quick response. Better Testing The fiber optic cable meter is designed for a wide measuring range of -70 to +10dBm, the fiber optic power meter allows higher accuracy. Reliable Use Our optical performance tester also has a relative power calculation and calibration function, making the measurement much more convenient. The wavelength: 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650nm, 10 types wavelength for work. EASY CARRYING Light in weight and compact in size, the easy carrying allows for both indoor and outdoor use. Specification: Item Type:Fiber Optic Power Meter Model: AUA-DC7. Material: ABS Probe type: InGaAs Wavelength Range: 850-1650nm Standard Wavelength (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 Automatic shut-off time: 10 minutes. Power measurement range: -70~+10dBm Power supply: 3.7V 650mAh polymer battery, comes with built-in battery. Package list: 1 x fibre optic power meter. 1 x neck strap. 1 x USB cable. 1 x user manual (English language not guaranteed) Package List 1 x Optical Fiber Power Meter 1 x Lanyard 1 x USB Cable 1 x User Manual