Selling Cheap Temperature Gauge from PT Inovasi Sinergi Jaya in Jakarta. Temperature gauge is a temperature sensor equipment that is still analog. This equipment is used to determine the temperature of the machine or tool in accordance with the needs of its users (local). The working principle of the temperature gauge is based on the principle of metal expansion or so-called bimetallic. Bimetal is a temperature sensor made of two metal plates with different expansion coefficients (α) glued together.