Digital LCD Display: Clear, easy-to-read screen shows humidity and temperature at a glance, suitable for all ages. Humidity & Temperature Monitoring: Accurately measures indoor relative humidity and ambient temperature to help you prevent mold, dryness, and discomfort. Fahrenheit or Celsius Options: Available in Fahrenheit or Celsius versions so you can choose the unit that best matches your local preference and usage habits. Mini Round Design: Compact round gauge fits easily on desks, shelves, instrument panels, storage cabinets, or inside humidors and terrariums. Indoor Use: Designed for indoor environments to help you manage climate-sensitive items like musical instruments, cigars, wine, plants, and electronics. Battery Powered: Low-power consumption digital module runs on standard button cell batteries (included in most sets; check variant details), convenient for long-term use. The digital module is designed for indoor environments to help you manage climate-sensitive items like musical instruments, cigars, wine, plants, and electronics. It features a low-power consumption design and runs on standard button cell batteries, which are included in most sets. Color: Black Material: plastic Package Contents: 4*electronic hygrometer thermometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.