☘️ Unused item Length: 40 centimeters This is a small ruler perfect for use in factories, laboratories, measurement rooms, and workshops. It can be used for measuring the area of various products, accurate detection and calibration of various measuring instruments, measuring the reduction ratio of photographic printing film, and detecting the size of optical projection maps. Film Flexible Ruler 40 cm 0.1 mm Scale R Angle and Width Line PET Folding Straight Ruler Calibration Soft Ruler Measurement Tool Transparent for Factory Use 5-50 990⭐️⭐️⭐️⭐️