Just released Vecorder, a new free android app for estimating the height of objects! Move along the object and let the app derive the height difference through the acceleration sensors of your device! Would love to here some feedback about this app, especially the success/failure rates of your height scans.
Try it out through Google Play: https://play.google.com/store/apps/details?id=de.mathfactory.vecorderfree
Try it out through Google Play: https://play.google.com/store/apps/details?id=de.mathfactory.vecorderfree