Features HANDHELD OPTICAL POWER METER --- Mainly used for continuous optical signal power measurement and fiber optic line on off testing. Adopting a single chip microprocessor for control, with complete functions. APPLICABLE SCENARIOS --- Widely used in the construction and maintenance of optical cables, optical fiber communication, optical fiber sensing, optical CAT and other fields. FINE DESIGN --- The body design conforms to ergonomic requirements and adopts advanced cold molding technology, which is beautiful and durable. EASY TO USE --- The all in one machine has a compact appearance, automatic on off function, adjustable power, wavelength memory function, automatic recognition of working frequency, support for lighting, storage and other functions. STRONG COMPATIBILITY --- Supports user calibration and supports SC, FC, and ST interfaces; Supports linear (nW) and nonlinear indicators (dB); Support RJ45 testing. Specification: Item Type: Optical Fiber Power Meter Material: ABS Wavelength Range: 800 to 1700 Detector Type: InGaAs Measurement Range (dBm): -70 to +10 Uncertainty: ± 5% Standard Wavelength (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625 Display Resolution: Linear Display: 0.1% Logarithmic Display: 0.01dBm Red Light Working Wavelength (nm): 650 Test Range (KM): Approx. 30000m / 98425.2ft Frequency Identification (Hz): 0, 270, 1000, 2000 RJ45 Line Finding Distance (m): Approx. 200m / 656.2ft Input Voltage (V): 3-6 Working Temperature (℃): -10 to +60 Storage Temperature (℃): -25 to +70 Automatic Shutdown Time (min): 10 Battery Continuous Working Time (h): Greater than or equal to 48 (measured by a single power meter) Battery (mAh): Rechargeable lithium battery 1100mAh x 1 [shipped with built in battery] Package List:1 x Multifunctional Optical Power Meter  1 x USB Cable   1 x Portable Rope  1 x Ceramic Tube  1 x Manual  Package List 1 x Multifunctional Optical Power Meter 1 x USB Cable 1 x Portable Rope 1 x Ceramic Tube 1 x Manual