10 Wavelengths and 650nm Red Light: Tests multiple wavelengths (850/980/1270/1300/1310/1490/1550/1577/1625/1650nm) and features a 650nm red light for versatile fiber optic inspections. Optical Power Test Function: Units dBm/(m, μ)nW, wavelengths 850/980/1270/1300/1310/1490/1550/1577/1625/1650nm, REF reference.