The TECPEL DTM-321 series temperature and humidity meters feature temperature range from -20 to 60 °C (-4 to 140 °F), or in case of K-type -200 to 1,370 °C (-328 to 3,498 °F), humidity from 0 to 100% RH, a 4-digit three-section display, MAX/MIN function, AUTO POWER-OFF function, ΔREL function, automatic low battery indication and a RS232 interface for PC connectivity.