Features CLEAR COLOR LCD DISPLAY: Detail means professionalism, and a unique result or information display of optical power meter ensures a satisfying user experience DUSTPROOF AND PRACTICAL: Dustproof design can keep the connector of fiber optical power meter clean for a long time, support >20 hours of extra long standby SENSITIVE AND DURABLE: The chip of the fiber optical power meter is sensitive, the internal structure is strong, and the service life is long. Possess low battery consumption and continuous operation FAST AND ACCURATE: No need to wait for warm up, just plug and play. Fiber optic power meter has accurate test accuracy, optional switching display and automatic power off function EFFICIENT MEASUREMENT: In high bandwidth environments, reliable fiber optic power equipment is very important. This handheld optical meter can help check cable performance, calculate relative power losses, locate faults and troubleshoot Specification:Item Type: Optical Power MeterTest wavelength1310±50nm1490±15nm1550±10nmIsolation 1310nm~>40dB  >40dBIsolation 1490nm>40dB~ >40dBIsolation 1550nm>40dB    >40dB~Measuring range-35~+10dBm-40~+12dBm -40~+25dBm Measurement Uncertainty: ≤0.5dB Insertion Loss: ≤1.5dB Detector Type: For InGaAs Display Resolution: 0.1dB Optical Fiber Type: SM 9/125μm Threshold Setting: 10 Groups Optical Connector: For APC(interchangeable SC, ST) Complete Machine Index: Display: Color LCD screen Data Storage: 10 Data Interface: Micro USB Power Supply: 3 x 1.5V AA batteries(not include) Battery Life: Standby >20 hours Operating Temperature: -10℃~+50℃ Storage Temperature: -40℃~+70℃ Relative Humidity: 0~90% No condensation Package List:1 x Optical Power Meter1 x Storage Bag1 x Accessory1 x User Manual Package List 1 x Optical Power Meter 1 x Storage Bag 1 x Accessory 1 x User Manual