Sufficient quantity: here are totally 12 pieces round shaped humidity temperature meters in classic color, sufficient enough for satisfying the temperature and humidity detection in your daily life Create a comfortable living condition: this electronic digital humidity gauge monitor can quickly and accurately measure the indoor humidity and temperature, and it will measure every 10 seconds, thus you could adjust the humidifier and dehumidifier settings according to the measurement, providing you a comfortable living environment Measurement range: this mini hygrometer thermometer could precisely measure the humidity range from 10 to 99 percents and temperature range from minus 50 to 70 degrees Celsius, with high measurement accuracy, you will know your living condition at any time Size details: our humidity temperature meter sensor is approx. 45 mm/ 1.78 inches in diameter, its LCD display is approx. 25 mm/ 1 inch in diameter, light in weight and compact in dimension, portable to carry and store, won't take up more spaces Universal applications: these LCD display indoor humidity temperature meters are practical to detect both of temperature and humidity around you, suitable for families, school, office, baby's room, greenhouse, basements, cellars, laboratory, garden and other places