Digital Humidity Hygrometer Thermometer Indoor Outdoor Temperature Meter Features: 1. Indoor/outdoor temperature and indoor humidity display. 2. Celsius/Fahrenheit temperature display switching. 3. Maximum/minimum temperature and humidity memory function. 4. Dew point alarm function [-1°C to +4°C (+30.2°F to +39.2°F)]. Comfort Level Display: 1. Displayed when indoor temperature is 20°C to 25°C (68°F to 77°F) and indoor humidity is 40%RH to 70%RH. 2. Displayed when humidity exceeds 70%RH. 3. Displayed when humidity is below 40%RH. 4. No icon displayed when temperature exceeds 25°C (77°F) or falls below 20°C (68°F), with humidity between 40%RH and 70%RH. Temperature Measurement Range: Indoor: -0°C to +50°C (+14°F to 122°F) Outdoor: -50°C to +70°C (-58°F to +158°F) Humidity Measurement Range: 20%RH to 90%RH Battery Required: 1.5V (AG13) × 1 How to Use: 1. Open the battery cover. 2. Remove the battery. 3. Identify positive and negative terminals; place positive side up. 4. Reinsert battery and secure cover. 5. Device is ready for use. Note: If malfunction occurs, remove battery for approx. 2 seconds then reinsert. Package Includes: 1* Main Unit 1* Sensor Cable Notes: 1. Due to manual measurement, allow for 1-3mm size variation. Please ensure you are comfortable with this before ordering. 2. Allow for 1-3g weight variation. Please ensure you are comfortable with this before ordering. 3. Due to lighting and monitor differences, photos may not accurately reflect the actual color. Please confirm details before ordering. Thank you!