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  1. Calibrated Rulers - McMaster-Carr

  2. Calibrated and Certified Rulers - Precision Rules

  3. Fowler NIST-Certified Rulers - Cole-Parmer

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

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

  6. NIST Calibration Certificate Rulers - McMaster-Carr

  7. Calibrated and Certified Rulers

  8. 60"/1500 mm High Precision Rule w/ Certificate of Calibraton Traceable ...

  9. Calibrated Tape Measures - McMaster-Carr

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