I have a quick 'look it up' file and inventory system over here that I developed after the uncountable number of times running around looking for the offending mib in order to make a measurement. On a related note, I've measured so many marbles now, that I can actually typically guess, within some shocking level of precision, the size of a marble just by holding it. I'm sure many marble collectors can do the same trick; and not bragging either...it's just an interesting window into that eery 'knowing' that a ton of experience can bring to anything. I couldn't do the same trick with just any object, but with marbles, after lots and lots of experience, apparently now, I just know.