Product features:1. Brand-new appearance design, compact and small;2. With the three-in-one function of the red light source of the optical power meter;3. With the function of wavelength switching;4. With the attenuation value function of the PEF test light;5. Low battery prompt and 3.7V1500mA lithium battery.Function description:1. The optical power module has 6 wavelength calibration points of 850nm, 1300nm, 1310nm, 1490nm, 1550nm, and 1625nm;2. The light source has dual wavelengths of 1310nm and 1550nm;3. Detect optical fiber connectivity and optical fiber breakage, bending and other faults;4. PEF switching can be applied to the test of relative power or insertion loss.Technical parameters:Product model: NF-919Display: color screenLight source function: wavelength 1310/1550nmFrequency 00Hz, 270Hz, 1000Hz, 2000HzOptical power test function: unit dBm/(m,u)nWWavelength 850nm/1300nm/1310nm1490nm/1550nm/1625nmREF referenceAuto shutdown (30 minutes): on/offLow battery prompt: yesOperating environment temperature: minus 20 degrees Celsius to 50 degrees CelsiusPower supply: 3.7V1500mA carp batteryProduct size: 139x84x29mm