Simultaneously displays humidity from 10.0 to 95.0 %RH; temperature from 0.0 to 199.0°F (–18.0 to 93.0°C) on a 11¼8" LCD display. Resolution is 0.1°C and 0.1% RH. Temperature accuracy is ±1°C (from 0 to 40°C and ±2°C outside this range. The precision resistive polymer film sensor has a humidity accuracy of ±2%RH in the mid-range and ±4%RH outside of the mid-range. Memory function stores Min/Max measurements for both temperature and RH. "HOLD" button allows user to "freeze" readings on display. Unit features auto-off function to save on battery life (feature may be disabled by user). This hygro-thermometer also features RS-232 output socket for data transfer. Unit comes complete with probe/cable, manual, Traceable® Certificate, a hard, plastic carrying case and a 9V battery.