Measurement Range (dBm): -35~+10DBm; -40~+12DBm; -40~+25DBm Wavelength(nm): 1310±50nm/1490±15nm/1550±10mm Model: TM581 PON Power Meter 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. Uncertainty: Less than ±0.5dB, Weight: 0.99648942424 pounds, Manufacturer: Jaywool