I don't know much about Sonic checkers but I use one regularly in the shop. I paid $1200 (many years ago) for mine and it came with one probe. I want to say each additional probe was around $200. I purchased the the unit I have after a lot of research and finding out it seems to be the most common one used by other head porters. I have four probes, two curved for testing round surfaces and two flat ones for checking flat surfaces. They probes are different for aluminum and iron. If you don't use the correct probe for the shape and material you are working on you won't get an accurate reading. That's just my experience with the unit I have. Others maybe different. I have seen several Sonic tests for Pontiac engine that have shown cylinder walls a LOT thicker than any we have ever tested.... I've often wondered if the test was performed properly and with the correct probe.
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