Interesting little crystal tester I got from ebay

I saw a video by Joernone where he shows a crystal tester he built. I thought that would be pretty cool to have but I did not have some of the components to build one. While looking to order them I found a completed board that does all the same things plus a go/no go light for a pretty reasonable price.

I bought the board, made some minor modifications to it, and mounted it in a project box.
Here are the results:

I went through all the crystals I had, I only found one dead one, a couple that oscillated strangely, and almost all of the crystals were spot on (or very close to) their rated frequencies.

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