✍ This precision sensor from Bosch is the best low-cost sensing solution for measuring barometric pressure and temperature. Because pressure changes with altitude you can also use it as an altimeter! The sensor is soldered onto a PCB with a 3.3V regulator, I2C level shifter and pull-up resistors on the I2C pins. The BMP180 replaces the BMP085.

✍ The good news is that it is completely identical to the BMP085 in terms of firmware/software/interfacing - you can use any example code/libraries for BMP085 as a drop-in replacement.

The pressure measurements are so precise (low altitude noise of 0.25m), you can even use it as an altimeter with ±1 meter accuracy.

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▼ Applications
Optimized for use in mobile phones, PDAs, GPS navigation devices and outdoor equipment.

▼ Features
High precision digital pressure sensors for consumer applications.
Ultra-low power
Low-voltage
I2C interface

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▼ Specifications
Atmospheric Pressure sensing range: 300 ~ 1100 hPa ±0.12hPa
9000m to -500m above sea level
Up to 0.03hPa / 0.25m resolution
-40 to +85°C operational range, +-2°C temperature accuracy