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How you ever wondered how fast your elevator is? How tall your building is? Then try new Elevator Measurement.
Just go inside an elevator, prepare you phone, it can be in any position, press "Start" on the phone, don't move the phone and press a button on your elevator. Wait till the elevator stops and on your phone you can read speed and distance of your elevator journey.
Also in settings you can adjust some values to fit the elevator you are measuring. Number of samples stands for how many samples it takes and Tolerance is a constant for each elevator to have good values, just play a little with it.
If you have an idea how to improve this app, just send me an email!