Precision Rules Precision Steel Rules Starrett rules are made from fine quality steel and produced to the highest precision standards, making them the most accurate and readable precision steel rules available. Through over 130 years of experience, we have developed the following versatile features, designs and styles: Our product line consists of: • Full-flexible 1/64"-1/50" (0.4-0.5mm) thick • Semi-flexible 1/50-1/40" (0.5-0.6mm) thick • Spring-tempered 3/64" (1.2mm) thick • Heavy spring-tempered 1/10" (2.5mm) thick • Stainless steel 1/64" or 3/64" (0.4 or 1.2mm) thick • Graduation styles are inch, millimeter, inch and millimeter, shrink, and special graduations • All rules are photo-engraved and tempered for long life and flexibility Rule with Aircraft Quick-Reading Graduations on lower edge Rule with Quick-Reading Graduations on both edges Accuracy • All of our precision steel rules are photo-engraved • We inspect to Starrett Master Standards, which are traceable to the National Institute of Standards and Technology • Measuring Tip: When using a precision rule for very close accuracy, the eye can read better by measuring between two lines rather than from the end of the rule to a line Readability Fea tures • The numbering size and style is distinctive and more readable than ordinary rules • Advanced,staggered graduations-When reading lines, it is much easier to count lines of differing lengths than those that resemble a comb. All Starrett graduations are staggered in a height pattern that makes reading easy. For reading very fine graduations such as 50ths (.020") or 100ths (.010") of an inch, Starrett designed an improved pattern of lines called "Aircraft Quick- Reading Graduations" (see photo). The name stems from its extreme popularity in aircraft plants and other shops using decimals. This pattern is also used on some of our millimeter rules. • Quick-reading figures are furnished with finer graduations for easier counting. Most all inch graduations of 1/32" and finer have subdivisions numbered (see photo). • All rules are available in Starrett no-glare satin chrome finish for easier reading and rust resistance • There are still some old "D" style rules on the market. These have one square and one rounded end. All Starrett rules are ground square on both ends. This provides better efficiency through the ability to read from either end on all edges. 284 P recision R ules , S traight E dges , P arallels