Feature: 1. 6 WAVELENGTHS: This optical power meter can test standard 850nm 1300nm 1310nm 1490nm 1550nm 1625nm wavelengths, covering most requirements of communication engineering maintenance. 2. UNIVERSAL INTERFACE: Universal optical interface supports for FC SC ST adapter. The body is ergonomically designed, very comfortable to handle. 3. MULTI FUNCTIONS: The meter has the functions of relative power calculation, calibration, automatic range conversion, battery power display, etc., very practical. 4. SENSITIVE AND PRECISE: With sensitive chip and sturdy internal structure, the measurement is fast and accurate, without waiting for preheating, plug and play. 5. LOW POWER CONSUMPTION: The battery consumption is low, supports more than 100 hours of continuous operation. Specification: Item Type: Optical Power Meter Material: ABS Model: TL537C Power Measurement Range: -50 to +26dBm (at 1550nm) Standard Wavelength: 850 1300 1310 1490 1550 1625 Interface Type: InGaAs Accuracy: 0.35dB±10nw Operating Wavelength: 800-1700nm Continuous Working Time: 100h (standby time: about 230h) Power Supply: 2 x AAA battery (shipped without battery). Package List: 1 x Optical Power Meter1 x Storage Bag1 x Manual