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TEC Controllers TEC (Thermo Electric Cooler) is a semiconductor device which can cool down or heat up the temperature of a target according to the direction of the current going through. By using our TEC controller, the target temperature can be regulated precisely by controlling the direction and magnitude of the current going throgh the TEC .Our Thermo-Electric Cooler (TEC) controllers have the features of high efficiency, high precision, high reliability and compact size. They are widely used for the temperature control in telecommunications such as DWDW, EDFA, passive fiber components etc., and also the temperature control of laser modules, diode pump lasers and sensors in instrumentation.