A free program for Android, by meydev.

This is a handy app that is ideal for measuring and calculating all sorts of distances. It offers several tools such as a ruler, a measuring tape, and a circle. The best thing is that it is extremely easy to use. Just tap on the screen to place your object, and then drag your line to measure the distance. The app will automatically calculate the length of the line and will also give you an option to use a measuring tape and a circle.

This app is great for people who are looking for a handy tool that will help them measure and calculate all sorts of distances.