I acquired several of these boxes years ago, and still use them frequently today. They can be real time savers for things such as "homing" in on exact values beyond the initial design stage calculations, and for unknown or uncertain values that you need to plug into an existing design. They also can be very useful for troubleshooting procedures. Last but not least, they are very quick and easy to use. Back when these boxes were quite popular, they were very reasonably priced and affordable by anyone -including hobbyists. Today, it's a different story as even a basic box that has decent accuracy, range, and voltage ratings are too expensive to justify their cost. A box such as this might start at $300 or $400. I have seen some boxes from China on eBay for well under $100 with some decent specs. However, I did have the opportunity to see the internals of some and it left me a bit suspicious about them.
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