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  1. Calibrated Rulers - McMaster-Carr

  2. NIST Calibration Certificate Rulers - McMaster-Carr

  3. Calibrated and Certified Rulers - Precision Rules

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

  5. Calibrated and Certified Rulers

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

  7. 24" /600 mm High Precision Ruler w/ Certificate of Calibration ...

  8. Fowler 52-262-624 NIST Calibration Certificate Rigid-Ruler Set, …

  9. Fowler NIST-Certified Rulers - Cole-Parmer

  10. 6"/152mm High Precision Rule with Certificate of Calibration