A continuity tester it's a fundamental tool to have but if you are in a jam without one you can make one out of a simple door and window alarm in this project i show you how. Watch the video Watch the video and see how it works. Gather the material You will need for this project:- Door & Windo...By: Engineer of None
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from Instructables: exploring - technology - robots http://ift.tt/1GIaBnf
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