Gauge Accessories | McMaster-Carr

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High-Accuracy Combination Squares

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2,450 Products

Most Likely Products

Variance Indicator Contact Points

Attach to your variance indicator to make contact with the workpiece being measured

123 products

Inside Hole Micrometer Handles

Screw into your micrometer head to extend its reach for measuring deep holes

1 product

Variance Indicator Contact Point Adapters

Convert variance indicators to work with inch-size contact points or measure hard-to-reach spots

3 products

Variance Indicator Extension Rods

Lengthen the reach of your variance indicator

19 products

Variance Indicator Clamps

Secure and position indicators, arms, and other components on holders

61 products

Hardness Testers

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

21 products

All Results

Measuring and Inspecting

Variance Indicator Contact Point Adapters

Convert variance indicators to work with inch-size contact points or measure hard-to-reach spots

3 products

Variance Indicator Extension Rods

Lengthen the reach of your variance indicator

19 products

Variance Indicator Clamps

Secure and position indicators, arms, and other components on holders

61 products

Variance Indicator Hole Attachments

Fasten to variance indicators to measure inside holes and around obstructions

1 product

Variance Indicator Lifting Cords

Lift the spindle on your variance indicator without touching the indicator

1 product

Variance Indicator Holder Fine-Adjustment Attachments

Install on Starrett variance indicator holders for precise control over positioning

1 product

Variance Indicator Caps

Cover and color-code the spindle on your variance indicator

1 product

Variance Indicator Holder Posts

Connect holder bases to clamps to hold variance indicators

5 products

Variance Indicator Holders

Position and hold variance indicators in place for accurate readings

52 products

Variance Indicator Depth Base Attachments

Insert the stem of your variance indicator to convert it into a depth gauge

7 products

Variance Indicator Backs

Replace the back on your variance indicator

21 products

Variance Indicator Lifting Levers

Replace the cap on your variance indicator to help lift the spindle

4 products

Variance Indicator Holder Bases

Thread a post into the hole to mount variance indicators

18 products

Variance Indicators

Identify small dimensional differences when checking part quality and alignment

23 products

Variance Indicator Calibration Testers

Check the accuracy of variance indicators to ensure precise readings

1 product

Variance Indicator Contact Points

Attach to your variance indicator to make contact with the workpiece being measured

123 products

Inside Hole Micrometer Handles

Screw into your micrometer head to extend its reach for measuring deep holes

1 product

Inside Hole Micrometer Spacing Collars

Replace the collar on your micrometer to connect extension rods

1 product

Variance Indicator Holder Arms

Fasten to a holder post to position variance indicators at any angle

3 products

Plug Gauge Handles

Add both a go gauge and a no-go gauge to create a custom tool for checking hole diameters

28 products

Feeler Gauge Holders

Clamp onto your feeler gauge to keep it in position

2 products

Caliper Depth Rods

Attach to your caliper to measure depth

1 product

Caliper Tips

Install on your caliper to measure hard-to-reach areas or center-to-center distances

4 products

Caliper Range Extenders

Expand your caliper's range to measure large items

7 products

Caliper Display Freeze Adapters

Hold the measurement displayed on your caliper after repositioning

1 product

Caliper Battery Covers

Protect the battery inside your caliper

8 products

Caliper Depth Base Attachments

Steady your caliper when measuring depth

5 products

Variance Indicator Collets

Hold the stem of plunger-style indicators for custom mounting jobs, such as creating depth gauges

4 products

Flatness Gauges

Determine if the flatness of surface plates, lapping plates, and other surfaces is within tolerance

1 product

Ring Gauge Holders

Keep ring gauges still to measure cylindrical parts or threads quickly and repeatedly

17 products

SPC Wireless Receivers

Connect to a computer to receive measurements from an SPC wireless transmitter

6 products

Cords for Measuring Tool Data Processors

Connect measuring tools with SPC output to a processor for uploading data

23 products

Precision Measuring Tool Sets

Multiple precision measuring tools in one convenient case

13 products

Outside Micrometer Stands

Hold micrometers to free your hands when measuring

3 products

Machine Tool Indicator Contact Points

Replace the contact point on your machine tool indicator

3 products

Caliper Calibration Checkers

Test your caliper's accuracy

2 products

Calibration Rods

Check and set micrometers and other measuring tools

31 products

Micrometer Heads

Mount on jigs, fixtures, and machine tools to position equipment and measure length

24 products

Height Gauge Scribers

Replace the scriber on your Mitutoyo height gauge

3 products

Tap and Drill Chart/Rulers

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

1 product

SPC Wireless Transmitters

Send data from measuring tools with SPC output to a wireless receiver

8 products

Height Gauge Scriber Clamps

Replace the scriber clamp on your Mitutoyo height gauge

5 products

Liquid-Level Tape Measures

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

58 products

Thickness Gauges

Move the thumb lever to quickly check the thickness of flat stock, pipe, or tubing

3 products

Depth Gauge Base Extensions

Increase the base width of your depth gauge to measure large holes

2 products

Radius Gauges

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

2 products

Gauging Pastes

Cover your tank-level ruler and change color to indicate the level of water or gasoline in your tank

2 products

Squares

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

12 products

Outside Micrometer Tips

Adapt your micrometer to measure curved and irregularly shaped objects, such as gear teeth and pipe

9 products

Measuring Wheels

Roll along surfaces to measure distance

13 products

Measuring Tool Data Processors

Analyze and print data from measuring tools with SPC output

3 products

Paper Rolls for Measuring Tool Data Processors

Replace the paper roll in your measuring tool data processor

1 product

Combination Square Heads

Attach combination square blades to form a combination square

28 products

Combination Square Blades

Connect to a combination square head to create a combination square

18 products

Map Distance Measuring Tools

Slide across maps and blueprints to measure distances

4 products

Calibration Spheres

Test your CMM probe and stylus against a precise reference point before you start inspecting

2 products

Micrometer Speeder Knobs

Color code micrometers by calibration date, precision, or other criteria

4 products

Height Gauge Calibrators

Ensure height gauges are accurate

3 products

Micrometer Head Mounting Brackets

Mount a micrometer head to your jig or fixture to accurately position workpieces

16 products

Hardness Testers

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

21 products

Metal Detector Calibration Kits

Test the sensitivity of food-processing metal detectors

1 product

Surface Roughness Testers

Trace the surface of a part to calculate its roughness parameters in Ra, Rp, and Rq

1 product

Hardness Tester Indenters

Hard enough to make impressions on most metal to determine Brinell hardness

2 products

Calibration Columns

Calibrate the flow rate of metering pumps

14 products

Force Gauge Grips

Pair with force gauges to test wire, pins, and thin sheets

10 products

Leveling Rods

Use with sight levels to estimate the distance between you and a given object

5 products

Torque Gauge Connectors

Replace square-drive connectors on torque gauges

3 products

Magnifiers

Workstation, hand-held, headband, and eyeglass magnifiers

4 products

Scales

Bench-top, hanging, floor, and conveyor scales

6 products

Tachometers

Measure the speed of rotating parts on machines such as shafts, gears, and belts

1 product

Thermometer Air Purges

Blow dust and moisture off infrared thermometer transmitter lenses

1 product

Thermometer Cooling Jackets

Connect to a compressed air or water line to keep infrared thermometer transmitters from overheating

1 product

Thermometer Insulating Tubes

Prevent infrared thermometer transmitters from overheating by shielding them from hot surfaces

1 product

Thermometer Covers

Prevent dirt buildup on infrared thermometer transmitters

1 product

Weather Stations

Measure multiple weather conditions at the same time

1 product

Data Recorders

Log temperature, humidity, or pressure levels to track changes and troubleshoot your system

56 products

Combustion Analyzers

Measure boiler and furnace combustion efficiency

1 product

Voltage Meters

Measure voltage in electrical components

3 products

Flaw-Detecting Dyes

Reveal flaws and cracks in nonporous material by turning them red under natural light

1 product

Plumb Bobs

Suspend from a string to create a vertical reference line

11 products

Gloss Meters

Measure the gloss of paint, coatings, and surfaces to ensure each product is as shiny as the last

2 products

Color Calibrators

Calibrate your color meter to identify colors with precision

1 product

Fluid Handling

Thermocouple and RTD Fittings

Alter probe immersion depth or adapt unthreaded connections for use with threaded tanks and heads

50 products

Thermocouple and RTD Protection Tubes

Shield thermocouple and RTD probes in large, unpressurized tanks

16 products

RTD Transmitters

Send temperature readings from RTD probes in containers, tanks, and pipes to switches and PLCs

10 products

Temperature and Humidity Transmitters

Regulate heating and cooling by sending temperature and humidity levels to PLCs and controllers

3 products

RTD Connectors

Attach plug-in connectors to RTD probes with wire leads

2 products

Thermocouple and RTD Mounts

Join thermocouple connectors and probes that have different connection types

18 products

Thermocouple and RTD Connection Heads

Seal out dust and moisture and allow access to thermocouple and RTD sensor connections

7 products

Thermocouple Transmitters

Check system temperatures from your smartphone or tablet

9 products

Hydraulic Accumulator Charging and Gauging Kits

Fill accumulators with nitrogen and test the pressure to ensure it’s within the correct range

1 product

Sights

Observe and monitor the contents of pipes, tanks, and other containers

231 products

Flow Sights

Visually confirm flow and inspect liquid color and clarity

152 products

Liquid-Level Transmitters

Send liquid-level data to logging and monitoring equipment

28 products

Gauge Guards

Shield gauges from corrosive liquids and gases; also called diaphragm seals

15 products

Gauge Liquids

Refill the liquid indicator on gauges with a U-tube

5 products

Gauge Glass

Create or repair liquid-level gauges to monitor fluid levels in containers

129 products

Pressure and Vacuum Transmitters

Convert pressure and vacuum measurements into a signal sent to remote displays and controllers

97 products

Pressure Transmitters

Send pressure readings to controllers and remote displays

370 products

Vacuum Transmitters

Transfer vacuum measurements to remote displays and controllers

16 products

Differential Pressure Transmitters

Relay pressure changes in heating, cooling, and pumping systems to controllers and remote displays

70 products

Differential Pressure Switches

Activate controls and alarms when the pressure difference between process lines exceeds a setpoint

53 products

Differential Pressure Sensors

Attach to gauges and switches to detect static pressure changes in air-handling equipment

5 products

Pitot Tubes

Connect to gauges to measure air flow in filters, cooling coils, and other air-handling equipment

4 products

Flow Transmitters

Send flow rate measurements to PLCs, data loggers, and remote displays

84 products

Containers, Storage, and Furniture

Multimeter Cases

Store and carry multimeters

9 products

Saw Blade Cases

Store and protect circular saw blades

5 products

Caliper Pouches

Keep your caliper protected and within reach

1 product

Caliper Cases

Store, protect, and carry calipers

8 products

Micrometer Holsters

Keep your micrometer protected and close at hand

1 product

Flatness Gauge Cases

Specially fitted to store and transport flatness gauges

1 product

Depth Gauge Cases

Specially fitted to store and transport depth gauges

3 products

Precision Measuring Tool Set Cases

Specially fitted to store and transport measuring sets

1 product

Micrometer Cases

Specially fitted to protect micrometers during storage and transportation

7 products

Variance Indicator Cases

Specially fitted to store and transport variance indicators

6 products

Measuring Square Cases

Specially fitted to protect Starrett combination squares

1 product

Tape Measure Holders

Keep tape measures close at hand

2 products

Density Meter Jars

Add liquid and immerse a density meter until it floats for precise readings

6 products

Electrical

Development Board Sensor Modules

Transform your development board into everything from an airflow monitor to a motion detector

11 products

Material Handling

Robot Tool Calibration Styli

Calibrate robot arm movement for precision in tasks such as attaching fasteners

1 product

Facility and Grounds Maintenance

Metal Detectors

Locate metal underground; screen people for concealed metal objects

1 product

Safety Equipment

Heat Stress Monitors

Measure temperature, humidity, and radiant heat to keep people safe from heat-related hazards

4 products