Metric Scales | McMaster-Carr

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512 Products

About High-Quality Rulers

What separates a throwaway ruler from one you’ll keep for decades, which type is best for everyday use, and how to compare materials.

Rulers

Horizontal Rulers

Rulers

Your go-to rulers for everyday measuring—available with certificates traceable to NIST

71 products

Adhesive-Back Rulers

Permanently stick to surfaces for repeated, hands-free measuring

75 products

High-Accuracy Rulers

Our most accurate rulers, with tolerances tight enough for machining detailed parts

40 products

Magnetic High-Accuracy Rulers

Take machine-shop-accurate measurements while keeping your hands free

3 products

Easy-Read Rulers

Measure where it's too bright or too dark to read a standard metal ruler

13 products

Pocket Rulers

No bigger than a pen for measuring on the go

5 products

See-Through Rulers

Made of clear plastic, so you won't lose sight of what you're measuring

2 products

Center-Finding Rulers

Quickly locate the center of workpieces without any math

3 products

Pocket Center-Finding Rulers

Tuck into your pocket to find the center of workpieces on the go

1 product

Folding Rulers

Combine the rigidity of a ruler with the portability of a tape measure

1 product

Tape Rulers

Unwind from a roll and cut to the length you need, similar to masking tape

1 product

Vertical Rulers

Measure height and depth without reading sideways

11 products

Adhesive-Back Vertical Rulers

Stick to walls and tanks for repeated, hands-free height and depth measurements

8 products

Scale Rulers

Half-Measure Adhesive-Back Rulers

Take division out of the equation when building half-scale models and prototypes

4 products

Other Products

Diameter Identifiers

Tighten the strap around rods, drill bits, and other small items to measure outer diameter

1 product

Tape Measures

Standard, long, center-finding, and flexible tape measures

79 products

Map Distance Measuring Tools

Slide across maps and blueprints to measure distances

4 products

Parallel Rules

Draw parallel lines, as well as circles, arcs, and angles

1 product

Combination Square Blades

Connect to a combination square head to create a combination square

2 products

Load Cells

Measure forces and send them to computers to monitor and trigger actions in machinery

16 products

Pipe Size Chart/Rulers

Curl around pipe to gauge its size, measure its diameter, or mark lines

3 products

Squares

Check 90° angles during layout work with combination, angle, or pipefitters' squares

24 products

Depth Gauges

Reach into slots, counterbores, and other holes to measure depth

22 products

Radius Gauges

Check convex and concave radii of tools, patterns, and dies

4 products

Depth Micrometers

Measure slots, counterbores, and other holes more precisely than depth gauges

11 products

Scales

Bench-top, hanging, floor, and conveyor scales

1 product

Staff Gauges

Typically mounted to walls and tanks for measuring the level of liquids, such as water, fuel, and oil

4 products

Squareness Gauges

Check frames and machined parts to see if they are leaning or uneven

3 products

Straightedges

Draw straight lines and check the straightness of surfaces

3 products

Liquid-Level Tape Measures

Lower into deep containers, such as tanks, to check the level of oil and other fluids

27 products

Chamfer Gauges

Check the diameter of chamfered edges to make sure they're within tolerance