Eti microtherma 1 handheld thermometer eti 221 091 p the microtherma 1 microprocessor based thermometer from eti measures all temperature over a wide range from 270 to 1768 deg c with a 0 1 deg c resolution it incorporates an easy to read 4 frac12 digit dual lcd display with open circuit low battery hold max min and deg c deg f indication p p and this thermometer should never need recalibrating as the built in microprocessor enables the instrument to continuously and automaticall