Honeywell T7047G1018 AVERAGE SPACE SENS-T7300 WHITE

T7047C is a 2-wire remote space sensor for applications requiring remote setpoint adjustment.
T7047G is a 2-wire remote space sensor used as one half of an averaging sensor network.
T7047C,G contain a carbon type negative temperature coefficient (NTC) thermistor sensing element.
T7047H is a thin-film, platinum 1K (at 0 C), positive temperature coefficient (PTC) temperature sensor only and is for use with the Excel 80/100/500/600 Controllers.
Locking cover.