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Pi Tape® brand Precision Linear Rules are available in Blue Easy to Read material. Use the vernier scale (separate piece) in conjunction with the linear rule to achieve the measurement. Both the linear rule and vernier scale are 1/2" wide. These Precision Linear Rules are constructed in Blue Easy to Read 1095 spring steel. The standard thickness of the material is .015”. Each Pi Tape® brand precision measuring tape is furnished with a Calibration Report whose measurement results are traceable through NIST to the international system of units (SI). Please click here to view our ISO/IEC 17025:2017 Certificate of Accreditation (pdf).Specialty sizes available upon request. 2024 Precision Linear Rule with Vernier Scale Price List 2024 Custom Made Precision Linear Rules with Vernier Scale Price List