Film Ruler 4 Inch 0.5mm Scale PET Plastic Film Straight Ruler

The folding ruler is made of PET clear plastic, which is worn resistance and unbreakable. It is durable and sturdy, has excellent light transmission, and minimal error caused by temperature for long lasting use. The small ruler is perfect for factories, research institutes, measuring rooms and workshops use. It can be used to measure the area of a wide variety of products, accurately detect and calibrate various measuring instruments, measure the reduction rate of photo printing films and detect the size of optical projection maps, etc.