Description 1. Air comfort indicator: The humidity thermometer has a face icon that quickly indicates the air condition with just one glance. Suitable for monitoring family living conditions and health by preventing colds, dry skin, mold, etc.2. Easy to install: The mini digital humidity meter with a double-sided pad, you can stick or place it anywhere you like, such as counters, baby rooms, kitchens, basements, offices, greenhouses, guitar rooms, offices, gardens, and wine cellars.3. Reliable accuracy: The comfort level of the smiley face is that the temperature should be below 26 degrees and the humidity should be 40% - 70%, which is a smiley face. If it is just humidity, if the temperature is not below 26 degrees, the smiley face will disappear.4. Small and portable: The household thermometer measures 1.77 x 0.62 inches and weighs only 22 grams, which is durable and portable, saving space and carrying it with you.5. Wide application: The humidity thermometer can be applied to homes, offices, cars, laboratories, greenhouses, etc. It can be used with humidifiers, heaters, air conditioners, etc.