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    5 Products
    About High-Quality Rulers
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    What separates a throwaway ruler from one you’ll keep for decades, which type is best for everyday use, and how to compare materials.

    High-Accuracy Rulers

    With tolerances tight enough for machining detailed parts, these rulers are the most accurate we offer. They're also the most precise, with graduations as small as 1/64", so you can trust them for even the tiniest dimensions. Also known as machinists' rules.
    All are etched in the U.S. and precision made to meet federal standards. Made of tempered steel for extra strength, they keep their shape even after multiple hard hits and drops, so they'll measure accurately for years to come. Their graduations are deeply engraved and blackened with ink, meaning they won't rub off like printed graduations can.
    Satin Chrome-Plated Steel
    Image of Product. Front orientation. Rulers. High-Accuracy Rulers, Chrome-Plated Steel.
    Tough enough to handle most tasks, these rulers are chrome plated to resist rust. Their satin finish reduces glare for easy reading.
    Starrett Rulers—These rulers are manufactured by Starrett, one of the most trusted names for precision measuring tools.
    Calibration Certificate—When precision measurements are required for quality control or by regulation, use a ruler that includes a calibration certificate traceable to NIST. The certificate states that the ruler has passed a test for accuracy, so you can be confident your measurements are correct and consistent.
    Rulers
    Rulers with
    Calibration Certificate
    Lg.
    Front Graduations (Numeric
    Graduations)
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    Mfr. Model
    No.
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    Inch/Metric
     
    Starrett Rulers
    5 3/4"/150 mm1/32" (4/32"), 1/64" (8/64")0.5 mm (10 mm), 1 mm (10 mm)-0.0035" to 0.004"/-0.09 mm to 0.1 mm1/2"1/64"Fed. Spec. GGG-R-791C331-1502285A55000000———0
    5 3/4"/150 mm1/10" (1/10"), 1/50" (1/10")1 mm (10 mm), 0.5 mm (10 mm)-0.0035" to 0.004"/-0.09 mm to 0.1 mm1/2"1/64"Fed. Spec. GGG-R-791C334-1502285A45000002117A77000000
    5 3/4"/150 mm0.5 mm (10 mm), 1/32" (4/32")1 mm (10 mm), 1/64" (8/64")-0.0035" to 0.004"/-0.09 mm to 0.1 mm3/4"3/64"Fed. Spec. GGG-R-791C636ME-1502117A51000002117A7300000
     
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