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 Package Includes: 1x Power Meter note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.