This type of Handheld optical meter is a compact and an easy-to-use testing instrument for optical fiber networks, which can be used for absolute optical measurements as well as for relative loss measurements in optical fibers.Telecom Maintenance,CCTV Maintenance; Comprehensive cable construction system,Optical instruments research and development; Optical communication education and lab testing; Other optical projectSupports 6 wavelength Testing, Auto-off function, with Backlight, self calibration48 hours super long standby time; simple interface ; support //st interface; working hour over 8 hours without charging.Material:plasticcolour:bluePackage Contents:1 x Optical Meter(Without battery)1 x Connector1 x ConnectorOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.