... field applications.ST800K Optical Power Meter can test optical power within the range of 800~1700nm wave length. There are 850nm, 1300nm ... of optical power.This meter can be widely used in the test of LAN, WAN, metropolitan network, CATV net or long ... temperature (°C)-30~+60Weight (g)430 (without batteries)Dimension (mm)200×90×43Battery4 pcs AA batteries (lithium battery is optional)Battery working ...