Mainly used for optical power measurement. Support 850/980/1310/1490/1550/1625nm wavelength, with measurement range -60~8dBm. Features: Support 6 wavelengths: 850/980/1310/1490/1550/1625nm wavelength, and show on the LCD screen at the same time. Compact size with simple interface and operation button, easy to use. With a built-in RJ45 cable tester, which is detachable, making it convenient to use. The RJ45 cable tester can automatically scan and test whether the network cable order is correct. Can be used for various types of optical interface, such as FC, SC, ST. Equipped with 700mAh battery for long working time and LED light for illumination in the dark. With cable tracing function(NF-908S), cable continuity testing function, check fiber breakage, winding,etc Specifications: Model: NF-908L / NF-908S (Optional) NF-908L: Without Wire Tracker & SCAN Function NF-908S: With Wire Tracker & SCAN Function Material: ABS Wavelength: 850/980/1310/1490/1550/1625nm Measuring Range: -60~8dBm Accuracy: 850/980nm0.5dB Optical Power Meter Power Supply: Built-in 3.7V, 700mAh lithium battery Wire Tracker Power Supply: 9V 6F22 battery (NOT included) Auto-off: 30 minutes Wiremap: Yes REF: Yes LED Lamp: Yes Item Size: Optical Power Meter: 115 * 45 * 25mm / 4.52 * 1.77 * 0.98in Wire Tracker: 185 * 45mm / 7.28 * 1.77in Package Weight: 165g / 5.82oz, 320g / 11.29oz Package Size: 12.8 * 7 * 3.5cm / 5.03 * 2.75 * 1.37in, 25 * 15 * 5cm / 9.84 * 5.91 * 1.97in Package List: NF-908L: 1 * Optical Power Meter 1 * RJ45 Remote Adapter 1 * Charging Cable 1 * Manual (English) NF-908S: 1 * Optical Power Meter 1 * Wire Tracker (Receiver) 1 * RJ45 Remote Adapter 1 * Charging Cable 1 * Manual (English)