We’re still not sure exactly how [connornishijima]’s motion detector works, though many readers offered plausible explanations in the comments the last time we covered it. It works well enough, though ...

This is also named as continuity tester. It is an indispensable tool to check broken wires and undesired shorting of wires. This is also named as continuity tester. It is an indispensable tool to ...