• Bi-Metals are made of two different metal sheet layers and a spiral form is given ,as the metals expansion rates differ from each other , due to these factors it spins upwards around its axis by heat.By a transmission wire this movement it is transmitted to the pointer. • Used where higher accuracy needed. • Used with gas and liquids which do not attack stainless steel 316L. Industry Sector: Petro-chemical plants, Machinery Manufacturing, Heating, ventilation, air conditioning (HVAC) and vessel manufacturers