Available in either electro-mechanical or more accurate electronic versions, these thermostats with their large easy to understand setting dials are ideal for use in systems where a constant temperature is required. Both electro mechanical type RMT and electronic type RET are available in 230 volt and 24 volt versions. More sophisticated dial setting thermostats, type RET-B utilise a microprocessor and provide more features including an LCD display which shows set temperature and actual room temperature. RET-B also improves comfort and economy by improved control technique..