Profile: Rugged Monitoring Company offers a wide range of rugged fiber optic sensors and monitoring solutions for diverse applications. Our O201 fiber optic temperature monitor is a compact design, din-rail mount and standalone OEM module that can be easily installed along with the devices / machines. This monitor is based on proven GaAs (gallium arsenide) technology of fiber optic temperature measurement. It is a multi-channel fiber optic temperature monitor that comes into 4 options that is 02 channels, 04 channels, 06 channels and 08 channels.