To find the right circuit in the electrical panel, you first plug the socket tester into a socket. Then you go to the panel ...

Imagine quickly diagnosing why your car's check engine light is on. A scan tool, also known as a trouble code reader, can help you identify the problem yourself.

So when I recently came across an early 1970s HP 7041A X-Y recorder while clearing out my parents’ attic, I knew that I just had to see if I could get it up and running again. What is the difference ...