Suitable for home, office, car, schools, hotels, laboratories, kindergartens, aquaculture, instrument workshops, libraries, factories, and other environments. This portable hygrometer thermometer measures indoor humidity and temperature in real time, helping to adjust humidifiers, dehumidifiers, and humidistats. Ideal for monitoring living conditions to support health by helping prevent colds, dry skin, asthma, and mold growth. Fast response with readings updated every 10 seconds, featuring 24 sensitive vents for accurate and reliable measurements. Wide measurement range: temperature from 0C to 50C, humidity from 10% to 99%. (Please allow for a small margin of error.) Temperature display in Celsius only. Black front panel with clear LCD screen for easy reading, even from a distance. Humidity measurement accuracy: 5% RH. Humidity display resolution: 1% RH. Temperature measurement range: 0C to 50C. Temperature measurement accuracy: 1C. Temperature display resolution: 0.1C. Panel cutout installation size: 42mm. Operating voltage: 1.5V, requires one LR44 button cell battery. Color: Black. Material: ABS plastic. Dimensions: 45 x 155 mm. Package includes: 5 x digital hygrometers, 5 x button batteries.