The Fowler 52-240-001-1 Outside Micrometer has the following specifications:
Accuracy: +/- .00015"
Fowler's Large Capacity Inch Micrometers are used for larger applications and is available in sizes up to 20". Each micrometer offers superior design and workmanship to ensure high precision and long life and at economical prices. Each micrometer includes a spanner wrench, fitted case and micrometer standard for sizes over 1".
Micro fine graduations on satin chrome finish and carbide tipped measuring faces
Diameter of measuring faces: .256"
Friction or ratchet stop thimble for exact and repetitive readings.
Hammer tone blue baked enamel finish.
Positive lever locking clamp
Spindle thread hardened, ground and lapped for ultimate accuracy.
Quick, easy zero adjustment on sleeve.
Anvil & spindle hardened and precision ground with micro lap finish on tips.
Meets or exceeds Federal accuracy
Includes a wrench and fitted case.
The Fowler 52-240-001-1 outside micrometer does not come standard with a certificate to NIST but can be done for an additional charge. The 52-240 Series of micrometers is often found with a great price in the Fowler Tool-A-Thon sales flyer.
Fowler Outside Micrometers - with Standards and Case - Inch: