This gauge is suited for measuring the medium temperature which has no corrosion with copperor copper alloys, and send out electrical message when the temperature reach or over the fixed valuethis gauge also used as cirurit shuter in temperature adjust system. Anti-corrosive type adopt thestainless steel material which is suited for the liquids or gases which has medium corrosionAccuracy Grade: 2.5,1.5 classTemperature Range: WTZ-280 is -20 °C ~ +160 °C.WTQ-280 is -20 °C ~ +600 °C.