Compact to carry: comes with 4 pieces mini hygrometer thermometers, compact in dimension and light in weight, won't bring burden or take up too much space, you can carry them anywhere at ease, enough quantity for your daily applications and replacements Create a comfortable living condition: our round digital humidity gauge monitor can measure both humidity and temperature for both indoors and outdoors, thus you could adjust the humidifier and dehumidifier settings according to the data, providing you a comfortable living environment Fahrenheit and Celsius: there is a button on the back side of electronic humidity temperature meter, making it easier for you to switch from Fahrenheit or Celsius by pressing the conversion button High accuracy: our indoor outdoor hygrometer thermometer will test the temperature and humidity for every 10 seconds, its temperature measuring range is from minus 58 to 158 degrees Fahrenheit (minus 50 to 70 degrees Celsius) and humidity measuring range is from 20 to 90 percents RH, with high accuracy, can accurately show you the latest data Clear to read: these digital indoor humidity gauges are made of quality ABS material, durable and stable for a lasting time, designed with clear LCD display, having no trouble reading the current number