Forget hunting for a tape measure or a protractor. Use your Android phone camera and sensors to handle different types of measurements easily.

Electronic enthusiasts that need to measure angles on their robotic arm or other projects may be interested in a new proximity sensor that has been created by William Moore called the Protractor. The ...

A theoretical astrophysicist uses his protractor to measure the universe. From a sheet of paper to the cosmos. Lots of pictures! This post is from Observer Short List—an email of three favorite things ...