Foldmeter turns your iPhone into a measuring tool – and your iPhone Duo into a folding rule: unfold it and the app shows its angle to the degree, live as you fold. ON EVERY IPHONE • Ruler: Centimeters or inches along both screen edges. • Diameter: Lay a screw or drill bit on the screen, drag the lines to its edges, read the size – with a hint for the matching thread size (e.g. M6 or 1/4″). • Protractor: Place an object on the screen, drag the arms to its edges, read the angle. • Level: Upright