Recommended uses for product landing pages Colorful Black 2-Pack Age Range: Adults and Children Number of units: 2 Battery quantity: 2 LR44 batteries required Response time: 10 seconds Lower limit of nominal temperature: 50 degrees Celsius Show less About this item Measuring range: Temperature range: -50 to 70°C; Temperature deviation: ±2°C. Humidity range: 10%~99% RH; Humidity deviation: ±5% RH. Mini and simple design: Thanks to its compact body and square shape, the device can be placed discreetly anywhere. Simple appearance with practical functionality. The screen is easy to read without any operation. Widely used: Suitable for use at home, office, car, school, hotel, laboratory, kindergarten, aquaculture, instrument workshop, library, factory, greenhouse, basement, garage, garden shed, 3D printer filament storage, and other air-conditioned environments. Indoor humidity monitoring: Helps measure indoor temperature and humidity over time, assists in adjusting humidifier, dehumidifier, and humidistat settings. Ideal for monitoring indoor living conditions and helping prevent colds, dry skin, asthma, and mold-related health issues. What you get: Digital hygrometer thermometer x 2. Each unit includes two AG13 button cell batteries. Replace the battery when the screen dims.