Features: The most compact in size, ideal-for field operation. The-general interface, can be directly connected to the FC-SC/ST, without complex conversion. Power measurements in dBm and loss in dB. The user has self-calibration function, the user can calibrate the optical power meter. With-wavelength memory function, boot will display the last shutdown-wavelength set. Optional 10 minutes without operation, automatic shutdown-function. Low battery indication. Specifications: Material:Metal+ABS Size:Approx.5x3x11.8cm/2.55x1.18x4.64inch 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.