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 (switchable via 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 and current readings Portable indoor humidity and temperature monitor; helps assess indoor air conditions 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 display differences may cause slight color variation between image and actual item Measurement error allowed: ±1–3cm