Electronic probes for the survey of temperatures, humidity and pressure; Electronic control panels; Surveying apparatus for the supervision of buildings and plants, namely, remote temperature, humidity, heating, cooling and ventilation units monitors for building operations and maintenance; Electrical controllers; Electronic controllers with remote control functions for operating heating, ventilating, air-conditioning and refrigerating systems; Humidity, pressure and temperature sensors; Temperature recorders; Computer interface boards, hardware and software for use in refrigeration, air conditioning or humidification management and control; Humidistats; fan speed regulators; electronic expansion valves; All of the foregoing being equipment and accessories for use with humidification, air-conditioning and refrigeration units and plants; Programmable electric and electronic controllers for heating, ventilating, air-conditioning and refrigerating systems, and components and accessories thereof, namely, user interface boards incorporating displays, electronic circuit boards for communication, electric and electronic expansion boards, electric and electronic humidifier interface boards, electric and electronic input / output boards, electronic chip cards for downloading and uploading software to the programmable controllers