Draw a box on screen to match a given pixel size exactly, then see how close your eye actually was.
Calibrating your sense of on-screen scale without reaching for a ruler tool every time.
Anyone doing pixel-level spec work who wants to trust their eye more.
Each round takes seconds; play a few in a row to see if you're consistently over or under.
Draw a box to match a given pixel size to sharpen your eye for exact dimensions.
