When you need a multimeter for testing electrical equipment around the home, it's vital to know what all those symbols around the dial mean.

If you'd like a voltmeter for a small project but don't want to shell out for a commercial model you can make your own using a dollar store pedometer, a PIC12F683 microcontroller, and a few other ...

[Martin Lorton] has a vintage Harmon 4200B selective voltmeter that needed repair. He picked it up on eBay, and he knew it wasn’t working, but it was in good condition, especially for the price. He’s ...