If your toolbox is missing the basics, projects get harder fast. These inexpensive tools cover the gaps most people overlook.

A continuity tester that indicates the resistance of, say, PCB traces with musically-related tones, whose pitch changes with ...

I have a drawer full of USB cables and every time I want to connect a device, I have to try them out. USB-C was supposed to ...

If you read about Hall effect sensors — the usual way to detect and measure magnetic fields these days — it sounds ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Dr. JeFreda R. Brown is a financial ...