About our product : This signstek hand-held optic power meter is a and an easy-to-use testing instrument for optic fiber networks, which can be used for unambiguous optic power measurements as well as for human loss measurements in optic fibers. It artful appearance, broad range of power measurement, inebriated accuracy and user self-calibration function with inebriated performance-to-price ratio. About : Maintenance in Telecom Maintenance CATV Fiber Optic Lab Testing added Fiber Optic Measurements Wavelength -LRB- nm -RRB- : 800-1700 Detector : InGaAs Measurement Range -LRB- dBm -RRB- : -50 ~ +26 Uncertainty : +5 % Calibrated Wavelength -LRB- nm -RRB- : 850,980,1310,1490,1550 Resolution -LRB- db -RRB- : 0.01 Optical Connector : FC -LRB- similar SC, ST -RRB- / as well as 2.5 mm comprehensive Power supply : Alkaline Battery -LRB- 3 AA 1.5 V battery -RRB- Battery Operating Time : 240h with 1.5 V battery Operating Temperature : -10 ~ +60 ? . Storage : -25 ~ +70 ? . : 175 * 82 * 33 Weight : 310g About Application : Maintenance in Telecom Maintenance CATV Fiber Optic Lab Testing added Fiber Optic Measurements About Package : Optical Power Meter preventive Rubber Boot User exercise subdued carrying case.