It has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature, barometric pressure that is generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI! This precision sensor from best low-cost, precision sensing solution for measuring barometric pressure with +/- 1 absolute accuracy, and temperature with +/- 1.0 accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with +/- 1 meter accuracy. Typical application: Enhancement of GPS navigation e.g.time-to-first-fix improvement,dead-reckoning,slope detection Indoor navigation(floor detection,elevator detection) Outdoor navigation,leisure and sports applications Weather forecast Health care application(e.g. sirometry) Vertical velocity indication(e.g. risk/sink speed) Target devices Handsets such as mobile phones ,table PCs,GPS devices Navigation Portable health caredevices Home weather stations Flying toys Watches PCB size:(L x W)1.52x1.20cm/0.60x0.47inch colour: purple Material: metal Package Contents: 10 x BMP280 Module 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.