Electronic industrial thermometer

An electronic industrial thermometer comprising an elongated casing having a rear wall with inner and outer surfaces, a pair of parallel side walls, said side walls having longitudinally extending grooves provided therein, an elongated transparent window forming the front wall of said casing and having the longitudinal edges thereof received in said grooves, said transparent window being spaced from the inner surface of said rear wall, an elongated plate with a graduated temperature scale thereon mounted within said casing adjacent the inner surface of said rear wall, an opening provided in the rear wall of said casing adjacent the bottom portion thereof, a tubular guide member with a bore therein secured on one end to the outer surface of said rear wall, said bore being aligned with said opening, said bore at the other end of said guide member being internally threaded, a hollow stem which is open at one end and closed at the other end being threadedly connected on the open end thereof to the threaded end of said guide member, said stem having the interior thereof aligned with said bore and said opening, a closed glass tube filled with mercury mounted in said casing in front of said graduated scale to visually indicate to a viewer the temperature upon changes in the level of mercury within said tube, said tube having an unexposed portion extending through said opening and said bore into said stem where said tube portion is spaced from the interior wall of said stem, a resistance temperature detector secured to the exterior wall of said tube portion located within said stem, a plurality of wires connected to said resistance temperature detector and leading therefrom through said stem and said bore and along the backside of said plate adjacent the inner surface of said rear wall, and an electrical receptacle carried by said casing and anchoring the ends of said wires for sending an electrical signal indicating the temperature as shown on said scale to a remote site.