Features 1、The 4 in 1 Tester: This optical fiber power meter with LED light can also be used as fault locator and RJ45 tester, meeting your various needs. 2、Wider Application: Widely used in fiber optic cable construction and maintenance, fiber optic communication, fiber optic sensing and so on. 3、Various Functions: Comes with automatic on and off, adjustable power, wavelength memory, automatic identification of working frequency and more. 4、Simpler Operation: Supports self calibration of SC, FC, and ST interfaces, supports nW linear and dB Logarithmic indicators, very practical. 5、Convenient Carry: Designed to have a light weight and a compact size as well, the optical power meter is very convenient to carry to outdoor. Specification Item Type: Optical Fiber Power Meter Wavelength Range: 800-1700 Detector: InGaAs Measurement Range: -50~+26dBm Uncertainty: ± 5% Standard Wavelengths: 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm. Linear Display Resolution: 0.1% Logarithmic Display Resolution: 0.01dBm Red Light Working Wavelength: 650nm Test Range: 5KM Frequency Identification: 0Hz, 270Hz, 1000Hz, 2000Hz. RJ45 Line Finding Distance: 200m Input Voltage: 3-6V Working Temperatur: -10~+60℃ Storage Temperature: -25~+70℃ Automatic Shutdown Time: 10min Battery Continuous Working Time: ≥ 48h, measured by a single power meter. Battery: 1 x rechargeable lithium battery, 1100mAh. Shipped with built in battery. Package List 1 x Optical Fiber Power Meter 1 x USB Cable 1 x Carrying Lanyard 1 x Ceramic Tube 1 x User Manual