... Auto off, Low voltage Optical Power Meter1. Brief introductionWith a wide range of functions, ST800 optical power meter is a powerful tool ... also aimed to a very low cost optical power meter.ST800 Optical Power Meter can test optical power within the range of 800~1700nm wave ... , 1300, 1310, 1490, 1550, 1625ST800-B-70~+10FC2 pcs AA batteries 850, 1300, 1310, 1490, 1550, 1625 Optical Power Meter (ST800)