Agile-shop 2-in-1 Digital Angle Finder Meter 600mm Protractor 0~360&deg; Stainless Steel Ruler Easy to measure all kinds of angle and draw lines Well used into various fields Angle Ruler, Straight Ruler and Square Ruler Ruler made of stainless steel for durability and rust protection for years of use A convenient stable locking function can lock the measurement at any angle or position to transfer a can calculate internal and external angles and measures length quickly and accurately