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Scanning vs Touch Probes

We are enquiring about a new CMM. I have been looking into 'scanning' probing, not so sure if this is what we want?? So, here I am, asking people with knowledge on this type of probing. I am NOT familiar with scan probes at all!
Some, if not a majority, of our inspections may be on sheet metal surfaces, which are NOT the same finish as machined surfaces. I , with no knowledge, would be concerned about the accuracy of scanning probes on an un-even surface.?? I also have heard, with as little of a 'crash' these probes can be problematic?

So, in closing, if you were to purchase a new CMM, would you include the scanning probe? To me it sounds too good to be true? Thanks!
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