This month's item is 13" long and has a 7.5" diameter wheel that's
numbered 1-24. The numbers are at 1" intervals with 1/8" secondary
markings between each whole number. It is specific to an industry. Click
here to enlarge. To see the back, click here. Good luck! Thanks to Tammy McD. for supplying us with this month's item!
Congratulations to Adam B of Austin, TX, for identifying this month's item!