I needed something to test out my sexually deviant boyfriends's history knowledge and also hurt his penis so when I discovered you could buy rulers with a list of British monarchs I was thrilled!
The ruler arrived quickly and looked exactly as expected, all 12 inches of it! Sadly, only 5 inches of it were needed to measure the penis in question. We then had a discussion about average penis length, 5.5 inches apparently, but I digress...
Unfortunately my below average subby boy had not learnt his Kings and Queens so the ruler was used to correct his mistakes. It made a pleasing thwacking sound when contact was made with the penis and didn't break or become deformed in any way. The ruler did not either.
After a few whacks of varying strength the penis (whilst below average was very hard) had turned a pretty shade of red which was the desired effect, so well done ruler!
I would wholeheartedly recommend this ruler for anyone who likes rulers, enjoys history, has a penis that needs spanking or requires a straight line.