Temperature measurement range: -20℃ ~ +60℃ (-4°F ~ +140°F) Temperature measurement accuracy: ±1.0 (±1.8°F), Temperature resolution: 0.1 (0.2°F) If the temperature is lower than -20℃, "LL.L" is displayed. If the temperature is higher than 60°C, "HH.H" is displayed. Measurable humidity range: 10%RH ~ 99%RH Humidity measurement accuracy: ±3%RH Humidity resolution: 1%RH, When the humidity is between 40% and 70% HR, it is comfortable. Green 'OK' for comfort (40% ≤ air humidity ≤ 70%) Red 'HIGH' for humid (humidity > 70%) Blue 'LOW' for dry areas (10% ≤ air humidity < 40%). Technical Specifications: Size: 6.7X4.3X2.5cm Color: White and Black Material: ABS Battery: CR2032 Note: If the display is unstable or the display performance deteriorates, please replace the battery. The battery can be replaced by following the OPENING and CLOSING instructions on the back of the thermometer.