The thermometer is made of high-quality plastic and has a long service life. Made of high-quality nontoxic odorless plastic, it is safe to use. This round indoor counter can display temperature and humidity at the same time, which is very convenient to use. This digital sanitary equipment is very suitable for indoor use, and can also be used in industrial applications and other occasions. Circular digital thermometers can be widely used to measure the temperature and humidity in homes, baby rooms, offices, workshops, schools, markets, etc. It can help you to check the indoor temperature and humidity effectively The wide digital LCD screen makes this small indoor digital sanitary equipment very easy to read even in a remote location. Small and easy to carry, it's portable for you It's an excellent gift to provide your family with better quality and a healthier living environment Overview of functions: LCD. The opening size is 41 mm in diameter (there is a small error in the measurement). total diameter: 42 mm (there may be a small error in the measurement). Humidity display. Humidity measurement range: 10 % ~ 99 % Humidity display resolution: One percent. The humidity sampling period is 10 seconds (1 minute). Humidity measurement accuracy is 5%. rated voltage: 1.5v DC (1 LR44/AG13 button battery). Temperature measurement range: from -50 to 70c. The temperature measurement accuracy is 1 degree (at normal temperature). Features: Net weight: 22g size: 4.5cm x 4.5 x 1.55cm. color: black. Material: acrylic+LCD. Contents: 2 thermometers.