Features: GY21 SHT21 Temperature Humidity sensorings Module delivers ±0.3°C accuracy and ±2% RH precisions via I2C interfaces, for environment monitoring systems and IoTs applications. industrial durability ensures stable performances across 40°C to 125°C temperature ranges and humidity detection. for engineers, enthusiasts, and developers creating smartests home devices, weather stations, or industrial automation. Integrate seamlessly into HVAC controls, greenhouses, or servers room for realtime climate data trackings and automateds adjustments. for long reliability, this I2C humidity sensorings module outperforms competitors with construction and plugs and play compatibility. Specifications: Module model: GY21-SHT21 GY-HTU21D Used chip: SHT21 HTU21D Power supply: 3-5v (with level conversion function) Module size: 12.8x10.5mm/0.5x0.41inch Type: Temperature and humidity sensorings module Color: Blue Package Includes: 1PC Temperature and Humidity sensorings Module note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.