These gauges come with a certificate of calibration traceable to NIST that states they’ve passed a test for accuracy.

Not only were these gauges calibrated in a lab, but they also come with a certificate that's traceable to NIST.

These gauges come with a certificate that’s traceable to NIST, confirming they were calibrated in a lab. Use them to verify whether external pipe threads are within tolerance.

Calibrated in a lab and backed by a certificate traceable to NIST, these gauges check if left-hand threads fall within tolerance.