It is based on their new BMP280 sensor, which is an upgraded version of the old BMP180 Barometer Sensor (BMP180). The module provides precise measurement of barometric pressure and temperature in the environment. The air pressure can be measured in a range from 300 to 1100hPa with 1.0 absolute accuracy. As for the temperature the sensor works perfectly for temperatures between - 40 and 85 with an accuracy of 1. Owing to its high accuracy on measuring the pressure, and the pressure changes with altitude, calculate the altitude with 1 meter accuracy, which makes it a precise altimeter as well. Another great thing about this module is that, you don' even need to worry about the I2C collisions as it provides both I2C and SPI interfaces. To use SPI, simply de-solder the bonding pads on the back. If you go with I2C, the board also provides 2 I2C addresses to select as you want. Note: As the sensor is quite sensitive to the environmental conditions, please DO NOT touch it with your fingers. High accuracy, absolute accuracy of 1.0 for pressure measurement and 1 accuracy for temperature measurement Supports both I2C and SPI communication Can be used as an altimeter with accuracy of 1 meter Supply Voltage: 5V Current Consumption: 0.6 mA Barometric Pressure Measure Range: 300 - 1100 Accuracy: 1.0 Temperature Measurement Range: -40 to 85 Accuracy: 1 Interface: I2C and SPI Material:Metal + Plastic colour:Purple Package Contents: 5 * Digital Sensor Module Only the above package content, other products are not included. Note: Light 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.