The RHCN-7000 series, a microprocessor-based controller for humidifying or de-humidifying features a simple on/off control. Relative humidity, output status, and error messaging are viewable on the unit’s bright-green three-digit LED display. Other features include an 8A relay output, optional RH probe, and it is compatible with most RH transmitters. Price Starts at $65. OMEGA ENGINEERING INC., Stamford, CT. (800) 872-9436.