SparkFun Atmospheric Sensor Breakout - BME280 Operation Voltage: 3.3V I2C & SPI Communications Interface Temp Range: -40C to 85C - Humidity Range: 0 - 100% RH, =-3% from 20-80% Pressure Range: 30,000Pa to 110,000Pa, relative accuracy of 12Pa, absolute accuracy of 100Pa Altitude Range: 0 to 30,000 ft (9.2 km), relative accuracy of 3.3 ft (1 m) at sea level, 6.6 (2 m) at 30,000 ft.