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  1. Calibrated Rulers - McMaster-Carr

  2. NIST Calibration Certificate Rulers - McMaster-Carr

  3. Calibrated and Certified Rulers - Precision Rules

  4. Calibrated and Certified Rulers

  5. Calibrated and Certified Steel Rulers by Schlenker Enterprises, Ltd

  6. 24" /600 mm High Precision Ruler w/ Certificate of Calibration ...

  7. Fowler NIST-Certified Rulers - Cole-Parmer

  8. Precision Rulers - McMaster-Carr

  9. DIN 865 High Precision Certified & Calibrated Rulers

  10. Certified Stainless Steel Rulers, Inch & Metric 1/32", mm - 6", …