Devonian Polyethylene Terephthalate High-Precision Transparent Crack Width Ruler,Scratch and Spot Appearance Inspection Ruler

1.versatile, can measure the length, width of cracks, scratches, and point diameter, area, etc. 2. Accurate measurement, point diameter 0.05-2 mm, line width 0.03-2.2 mm, accuracy ±0.01 mm. 3. Transparent PET material, flexible and durable. 4. The size is 61 x 96 mm, and the mini size is very convenient to carry and store. 5. Easy to use, put the ruler on the crack, scratch or point to be measured, select the appropriate line width or point for comparison, and measure the crack, scratch width and point size.