Touch screen testing

Buy a signature machine and use that. Signature machines are used by celebrities, politicians and charities to "hand sign" batches of thousands of documents.

Use a plotter with a calibrated spring-loaded stylus tip of the type you intend to use with your product. That way you can automate the test, too.

This would normally be a custom fixture sort of thing, btw.

My kids are available for a small fee. Testing to destruction is their forte

-Andrew M

You could buy a used unit on eBay and see how it looks after X years.

You could check with the manufacturer to find out what their longevity test showed.