Process Controllers and Din Rail Temperature Controllers monitor and control temperature, defrost, and fan cycles. Software for communicating with temperature controllers is included in this category. Indicators come as digital with LCD displays and the other as labels or strips. Sensors have various applications and designs. Dwyer has a choice of Digital Panel Mount, Limit and Mechanical Switches. Thermometers are either dial, spirit filled, or digital. Transmitters and Thermostats are also included in this category which monitor temperature and are economical.