The Breadboard Mini-Meter is a very cheap device capable of measuring volts and amp up to 100V and 1A with a sensitivity of 0.1.
It was designed and build to support the activities of the Science Olympiad Team of the local high school where my wife teaches physics and chemistry.
The instrument is very simple and it has a precision of only 3%, but is enough to help students learning the fundamentals of electricity and electronics.
I made it such that it can easily be attached to a breadboard to make measurement on a circuit assembled on it.
The YouTube video describing the details of this project is available here.
The files accompanying the project are available in this zip file: mini_meter.