This sensor kit includes a ground sensor and a sensor tube. The sensor tube functions as a housing, which allows for the ground sensor to be more easily replaced than if it was directly embedded in the outdoor surface. This kit is compatible with the SCE-120 Snow Melting Economy Control. The ground sensor, type ETOG-56, is designed for embedding in the outdoor surface using the ETOK-1 sensor tube. The ground sensor detects both temperature and moisture. The sensor tube, type ETOK-1, is a mounting tube for ETOG-56, supplied with a wood plug for covering the ETOK-1 hole during installation. Two ETOG-56 ground sensors can be connected to the SCE-120 Controller to keep large areas ice-free, even if they are exposed to a range of different conditions. Where an asphalt surface is used, or where easy installation is desired, installing ETOG-56 together with ETOK-1 is the obvious choice.