Bluespot Adjustable Professional Engineer Combination Try Square Ruler 300mm 12" The BlueSpot 300mm (12") Professional Combination Square is ideal for use as a square, height gauge, depth gauge, ruler or level. Manufactured from stainless steel for increased durability. Features easy to read metric and imperial measurements. Locating screws on all heads ensure quick and easy assembly. Ideal for use as a square, height gauge, depth gauge, ruler or level Manufactured from stainless steel for increased durability Features easy to read metric and imperial measurements Locating screws on all heads ensure quick and easy assembly Perfect 45? and 90? angles Includes scriber and level.