The programmable ON/OFF controller BTC7806, designed for wide range of applications. BTC7806 is equipped with a 3-digit LED display. BTC7806 has two programmable relay control/alarm outputs and a universal input from Pt100, Pt1000, PTC, 6 thermocouple types as well as linear current or voltage signals from external transmitters. All models have a built-in circuit for self-testing and self-calibration, manual measurement offset setting, and automatic software compensation of line resistance and cold junction temperature. The display-to-input correspondence (in case of linear input), the decimal point position, temperature measuring unit as well as the offset value are also programmable. Thanks to their user control options as well as excellent price-to-performance ratio, BTC7806 are exceptionally widely applicable devices.