The Probe Thermometer with Hygrometer makes it easy to monitor both ambient room temperature and the temperature in the whelping box at the same time (in the heated area for instance). Because heat rises, it is important to measure the temperature at ground level also (using the probe), as this is the temperature that dam and puppies are subjected to, and may be a few degrees lower than the rest of the room. The Probe Thermometer with Hygrometer will also let you measure the Relative Humidity in the environment also, which may be important if using it in puppy warming box. Features: LCD display Overall Dimensions: 150 x 88 x 25mm LCD Dimensions: 66 x 92mm Indoor and outdoor temperature display Relative Humidity display The highest/minimum temperature display Select to display in either ℃ or ℉ Specifications: Indoor -10℃ - 50℃ (14°F - 122°F) Outdoor -50℃ - 70℃ (-58°F - 158°F) Temperature display resolution: 0.1℃ Accuracy: ±1°C Temperature sampling period: 10 seconds Humidity Range: 25%RH - 98%RH Accuracy:+/-5% Power Supply: 1 AAA Battery (not included)