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Calibrated Rulers - McMaster-Carr
Calibrated and Certified Rulers
NIST Calibration Certificate Rulers - McMaster-Carr
Calibrated and Certified Rulers - Precision Rules
Certified Stainless Steel Rulers, Inch & Metric 1/32", mm - 6", …
Calibrated and Certified Steel Rulers by Schlenker Enterprises, Ltd
39"/1000 mm High Precision Ruler w/ Certificate of Calibration ...
Fowler 52-262-624 NIST Calibration Certificate Rigid-Ruler Set, …
Fowler NIST-Certified Rulers - Cole-Parmer
6"/152mm High Precision Rule with Certificate of Calibration …