Features: Power measurements in-dBm and loss in-dB. The most-compact in size, ideal-for field operation. The-general interface, can be directly connected-to the FC-SC-ST, without complex conversion. The user has self-calibration function, the user can calibrate the optical power meter. Back clip design, ergonomic, small and delicate size, easy to carry. Equipped with a bright LED lighting, convenient for line inspection and construction in dark environment. USB charging interface convenient and-fast (charging function). Specifications: Material:ABS Size:Approx.12.7x3.6x2.8cm/5x1.41x1.10inch Scope: 6dbm/26dbm Measuring range:-70~+6dBm/-50~+26dBm Probe-type:InGaAs Wavelength-range:850/980/1300/1310/1490/1550/1625 Interface:2.5mm universal interface Working hours:Dry cell 20h Automatic shutdown-time:15min Dry Battery Model:AAAx2 Note: .Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. .Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1x Power Meter