Measures displacement by double integrating the acceleration from your device's linear acceleration sensor. Note, that this app requires a linear acceleration sensor in your device for it to work. Not all devices with an accelerometer will have the linear acceleration sensor capability.
Keuwlsoft is the developer of the app that can be found in the Tools category. RMS Displacement Meter was downloaded and installed by over 5K users and its latest stable release was on Oct 28, 2017. Google Play displays that this application is rated 3.6 by its users.
The app contains ads. Download the latest installer of RMS Displacement Meter 1.0 free of charge and take a look at users' reviews on Droid Informer. It's safe to download the app.