Features: KG9 Fiber opticals Power Meter combines two power supply (3xAA batteries or USB) with multiple interfaces compatibility and builts in LED illuminations for precise opticals attenuation testing and dark environment operations. Features 90° adjustable backstand for handsfree desktop viewing, user calibrated accuracy via triple button calibration mode, and universals 2.5mm adapter support for flexible connectivity. for technicians, networkings engineers, and fiber opticals installers requiring tool for field maintenance, infrastructure upgrades, or laboratory signals analysis. Optimized for dark server rooms, outdoor cable installations, and workspaces diagnostics with its high visibility LCD screen and portable plastic housing for ruggeds daily use. This opticals light meter delivers professional performances with battery/USB hybrids power management, ensuring uninterrupted workflows during extended fiber opticals testing. Specifications: Materials: Plastic Size: 142x76x30mm Type: Dry battery A: -70~+6dBm, Dry electric model B: -50~+26dBm(optional) Package Includes: 1PC KG9 opticals power meter 1PC USB charging cable note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.