What's today's most accurate production retail calculator?

[HP67]

Thanks, that's the kind of info I was looking for. That's extremely interesting. The late model TIs do pretty well and some of the Casios are surprising too.

He only reports that for trig functions. I wonder if there is a site with info on a wider range of functions. Lots of good stuff on rskey. I have seen it before but have not seen every page.