... real-time clock Optical Power Meter (ST800K-U)1. Brief introductionWith a wide range of functions, ST800K-U optical power meter is a powerful ... a wide range of field applications.ST800K-U Optical Power Meter can test optical power within the range of 800~1700nm wave length. ... to versatile adapters (FC, ST, SC, LC)13) Handheld, large LCD backlight display, easy-to-use3. Specifications Wavelength range ...