In the PON network, by extracting a small part of the optical signal online, the PON power meter can be car-ried out in the whole FTTx service opening, maintenance and detection stage, which can reliably verify and to meet the requirements of network communication. It can test the optical power value of voice, data and video signals at the same time, and give the warning of exceeding the threshold. It is an perfect choice for engineering, construction and maintenance. Model: TM581 PON Power Meter Wavelength(nm): 1310±50nm/1490±15nm/1550±10mm Measurement Range (dBm): -35~+10DBm; -40~+12DBm; -40~+25DBm Uncertainty: Less than ±0.5dB Insertion Loss: Less than ±1.5dB Detector: InGaAs Display Resolution: 0.1dB Fiber Type: SM 9.125 μ m Threshold Setting: 10groups Optical Connector: SC/ Display:Color LCD Exter Storagar:10 Data Interface:Micro-USB Power Supply:Three 1.5V AA Batteries (Battery not included) Battery Lif: Standby 20h; Measuring time 12h Operating Temperature(°C):-10 ~ +50°C Storage Temperature(°C):-40 ~ +70°C Relative Humidity: 0 to 95% (non-condensing) Dimension(mm):186x100x50mm Weight(g):about 150g Package Included: TM581 Power Meter,USB Cable,Oxford Soft Case Note: Battery is not included. Colour:As Shown Material:ABS Package Contents: 1 set x fiber light meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.