E-Sport Mall via Amazon offers the Yahey Multi Angle Measuring Ruler w/ Protractor for $21.99 $17.50. Coupon code "44PRABXU" cuts it to $11.99. With free shipping for Prime members, that's $10 off list and the lowest price we could find. It's made of aluminum alloy and has a 12" long side arm and a 6.8" short side arm. Deal ends March 1.