JW3212A PON Optical Power Meter it aims at the FTTx application and maintenance which not only can be used to test and estimate the signals of the voice, data and video at the same time, but also can be used to test the continues wave light power. The calibrated wavelengths for CW light power measurements includes 850, 1300, 1310, 1490, 1550, 1625nm. It is an essential and ideal tester for the construction and maintenance of the PON projects. JW3211 optical power meter can be used for absolute optical power measurements as well as for relative loss measurements in optic fiber networks. An 1.0mm photosensitive area photodiode is used to significantly improve the stability and the reliability. It features ingenious appearance, wide range of power measurement, high accuracy, user self-calibration function and reference power level storage. JW3208 handheld optical power meter can be used for absolute optical power measurements as well as for relative loss measurements in optical fibers. It features ingenious appearance, wide range of power measurement, high accuracy and user self-calibration function with high performance-to-price ratio. JW3205 mini handheld optical power meter is the most lightweight and compact in size testing instrument. can be used for absolute power measurement in optical fibers.