One of the great features of the Arduino development platform is that you can make your own test equipment without too much effort, and the following project by Srijal Poojari is an excellent example of what is possible.
His "Companion IC" offers not only a neat desktop clock, but also offers an ohmmeter, capacitance meter, diode tester and could also be expanded for other uses. Not only is this easy to reproduce, Srijal also explains the theory and concepts behind the measurement functions which makes interesting reading as well. A demonstration is showin in the following video:
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