Design It is a small, portable meter powered by a 9V battery that lasts for about one year of operation. It comprises a reader part and a solid, metal measurement probe on the top of which there is a temperature sensor. Both parts are interconnected with a cable. The thermometer is equipped in a stainless steel probe that allows for easy measurement in stacks, piles, silos, etc. The probe with the reader is connected to the cable with the use of a jack plug.