Inch Scales | McMaster-Carr

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2,097 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

143 products

Adhesive-Back Rulers

Permanently stick to surfaces for repeated, hands-free measuring

174 products

High-Accuracy Rulers

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

134 products

Magnetic High-Accuracy Rulers

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

7 products

Easy-Read Rulers

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

61 products

Pocket Rulers

No bigger than a pen for measuring on the go

8 products

See-Through Rulers

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

6 products

Center-Finding Rulers

Quickly locate the center of workpieces without any math

8 products

Pocket Center-Finding Rulers

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

2 products

Folding Rulers

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

8 products

Magnetic Rulers

Measure hands-free without permanently mounting a ruler

3 products

Magnetic Ruler Sets

Keep multiple lengths on hand so you always have the size you need

1 product

Tape Rulers

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

2 products

Rulers for Cutting

Prevent nicking your fingers while measuring and cutting straight lines

7 products

Yardsticks

Your everyday classroom yardsticks

1 product

Circumference-Measuring Rulers

Find the circumference of duct, pipe, and other cylindrical objects without doing math

2 products

Vertical Rulers

Measure height and depth without reading sideways

12 products

Adhesive-Back Vertical Rulers

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

64 products

Rulers for Floors

Take repeated measurements of objects too heavy or too long to lift onto a workbench

9 products

Pica Rulers

Measure text, columns, margins, and other print elements in picas

4 products

Scale Rulers

Half-Measure Adhesive-Back Rulers

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

14 products

Half-Measure Adhesive-Back Vertical Rulers

Measure height while building half-scale models and prototypes—no division required

4 products

Other Products

Force Gauges

Test objects to see how much tension and compression force they can bear

116 products

Combination Square Blades

Connect to a combination square head to create a combination square

18 products

Levels

Ensure surfaces are completely horizontal or vertical

191 products

Load Cell Displays

Connect to load cells to view weight measurements

1 product

Tape Measures

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

228 products

Staff Gauges

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

28 products

Tap and Drill Chart/Rulers

Reference tap and drill sizes, measure in inches, and convert to decimals with one tool

1 product

Load Cells

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

258 products

Surface Finish Gauges

Compare your surface to the swatches to see if you’ve achieved the desired finish

4 products

Squares

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

117 products

Diameter Identifiers

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

1 product

Depth Gauges

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

28 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

Straightedges

Draw straight lines and check the straightness of surfaces

41 products

Protractors

Set bevels and measure angles with everything from pocket-size to long-arm protractors

20 products

Pipe Size Chart/Rulers

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

3 products

OSHA/ANSI Safety Gauges

Confirm gaps in bench grinders and machine guards meet OSHA and ANSI safety requirements

3 products

Radius Gauges

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

9 products

Hardness Calibration Test Blocks

Confirm testers are accurate for a specific Rockwell or Brinell hardness

13 products

Level Vials

Replace vials in levels or equipment

10 products

Hardness Testers

Determine the Rockwell, Brinell, or Durometer hardness of any material

26 products

Torque Gauges

Test the accuracy of torque wrenches and screwdrivers

57 products

Depth Micrometers

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

29 products

Load Cell Junction Boxes

Join multiple load cells to combine their weight measurements

2 products

Straightedge/Protractors

Draw straight lines and measure angle, slope, and rise with one tool

2 products

Scales

Bench-top, hanging, floor, and conveyor scales

1 product

Liquid-Level Tape Measures

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

61 products

Level Mounts

Strap to nonmagnetic surfaces to attach a magnetic level

1 product

Countersink Gauges

Catch sizing errors in countersunk holes to keep fasteners from protruding and creating weak points

24 products

Chamfer Gauges

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

17 products

Torque Sensors

Convert manually applied torque into an electrical signal that you can measure and record

16 products

Forklift Fork Level Indicators

Mount to your forklift's mast to check if forks are level from the driver's seat