When Apple announced the iPhone 6 and iPhone 6 Plus it also announced the inclusion of a new chip, the M8. The successor to the M7 that was found in the iPhone 5s, Apple’s M8 is the processor that handles all the data that relates to movement and relative location while using the minimum of power. The M8 is what makes apps like Health and associated utilities possible.

The iPhone 6 and iPhone 6 Plus have both brought an abundance of new features to the table. Among them, Apple has squeezed in a new M8 motion coprocessor, an upgrade on last year’s M7, which adds a barometer alongside other notable tweaks. Now, a free new app lets you use the barometer to check atmospheric pressure, and although the app is pretty bare-bones at its current duration, it is the only one that currently doesn’t cost any money.

Apple’s iPhone 5s mightn’t have brought many changes from an aesthetic standpoint, but in terms of hardware, the Cupertino based company really upped the ante. For instance, alongside the much-improved A7 SoC, the device also included the M7 coprocessor, and with the next-gen iPhone 6 set to include an A8 chip, details of the handset’s corresponding M7 have now emerged.