Maybe even throw in some fundamental stuff, like taking a compression tester to look at the car. I also like to take a cylinder leak-down tester and my Consult USB cable with my laptop to get a really good idea of the engine's bill of health without disassembling some stranger's car all that much, especially since all those things are not only cheap, but very valuable to just own for your own cars as well.
- Compression tester (~$14 shipped ebay, ~$24 Autozone)
- Cylinder leak down tester ($39 HarborFreight)
- Consult USB cable ($25 shipped ebay)
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