The Windows Phone app which has gone free next as myAppFree app of the day is G-Force meter. This is an app easy to use for measuring and displaying the gravitational and acceleration force.
G-Force meter Details:
Have fun with G-Force!
G-Force meter is an app easy to use for measuring and displaying the gravitational and acceleration force. It will display the acceleration in a smart and an interactive way. You can use this app for measuring the acceleration in your car, plane, yacht or on the rollercoaster. You can even save the maximum measured G-force and show it to your friends!
It will even measure the G-force in up and down direction!