Mini round digital humidity thermometer allows you to easily monitor the environment temperature and humidity Fahrenheit (°F) or Celsius (°C) conversion; this round thermometer displays temperature in either unit by pressing the conversion button Measurable humidity range: 10%–99%; humidity measurement accuracy: ±5%–10% at room temperature (25°C). Reliable performance with updates every 10 seconds for accurate real-time readings Portable indoor humidity and temperature monitor; helps you understand indoor air conditions; suitable for personal and professional use Battery: LR44 button cell Color: black Material: ABS Size: approximately 45 x 45 x 14mm Package Contents: 10 x Digital Thermometers Note: Light reflection and different displays may cause slight color variation between the image and the actual item. Measurement error allowed within +/- 1-3cm