Precision Clear Flexible Film Transparency Ruler - 12 Inch Measuring Tool for Accurate Size Estimation | Perfect for Crafting, Sewing, Engineering & School Projects

Designed for easier accurate, precision measurements of objects that are not flat. 24" length and the thin film makes this a very useful tool to follow contours and get a quick accurate measurement. Other brand transparencies may be imaged using a second generation copy from a master negative. Ours are first generatrion Master 8000 DPI for increased accuracy. Produced on high dimensionally stable lithographic film, .007 stable base polyester photographic film. A densitometer is used to calibrate the imaging equipment as well as a certified hglass scale and an Edmonson scientific 60 power microscope to measure each image. GUARANTEE OF ACCURACY First Generation Film imaged@=>4000DPI. (not a second generation copy from a master negative) Manufactured with .007 stable base polyester Film DMIN: 0.05 or less DMAX: 4.4 or greater Line Width: .0002 of stated or + / – 10% of stated feature spot size@ print down Geometric and Scaling Accuracy: .0015” over 24” @70degreesF/50%Rh Densitometer is used to calibrate the imaging equipment in production of the film Bishop Certified glass scale and Edmonson scientific 50 power microscope is used to measure each stated feature. COC or calibration certificate is not included. These charts are manufactured per the specifications above and are intended to streamline your inspection processes with a quick easy to use visual aid. Certification of these charts is not recommended using equipment or magnification levels beyond their intended use. When manufactured these charts are checked for accuracy with a 50 power microscope. Measurements are confirmed using a scale that measures in half thousandth increments, to a tolerance of half a millimeter. Ruler 1" width x 24" length (need a custom size, just ask!)