Features SENSITIVE CHIP Our mini fiber optic power meter has a sensitive chip and sturdy internal construction. Low battery consumption, 40 hours continuous operation 10 WAVELENGTH AND LIGHT SOURCES The wavelengths are 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650 and for SC, for FC and for ST adapters. Application Scenarios This mini fiber optic meter can cover most of communication technology maintenance requirements. Lightweight, easy to carry and use. Calibration Function Our fiber optic meter measures at -70 to +10dBm, can perform relative power calculations, and has a calibration function. Plug and Play This mini fiber optic meter can be fast and accurate. No need to wait for warm-up, plug and play. Specification: Element Type: Mini Fiber Optic Power Meter Model: AUA D7. Material: ABS Probe type: InGaAs Wavelength range: 850 to 1650 nm Standard Wavelength (nm): 850.980.1270.1300.1310.1490.1550.1577.1625.1650 Automatic shut-off time: 10 minutes. Power measurement range: -70 to +10 dBm. Power supply: 2 x AAA batteries required (batteries not included) Package list: 1 x Mini Fiber Optic Power Meter (Batteries not included) 1 x user manual (English language not guaranteed). 1 x neck strap Package List 1 x Mini Fiber Power Meter(Shipping Without Batteries) 1 x User Manual 1 x Lanyard