Electrical, electropneumatic, and mechanical devices, namely, temperature sensors, pressure sensors, humidity sensors, transducer indicators, temperature transducers, humidity transducers, temperature and humidity transducers, pressure transducers, [ light transducers, ] electropneumatic transducers, tristate pneumatic transducers, current transformers, power transformers, current switches, [ rotary actuators, ] pilot relays, power supplies, pressure probes, and thermowells, for use in industrial control systems and in residential and commercial HVAC systems