Electronics Sensors | McMaster-Carr

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10,763 Products

Electrical Power, Networking, and Controlling

Sensor Switches

Detect moving objects from a distance, triggering a circuit to open or close

681 products

Limit Switches

Turn equipment on or off when objects touch the actuator; often used for conveyors and bin filling

153 products

Magnetic Switches

Actuate when a magnet comes within sensing distance; often used to detect when doors or windows open

120 products

Snap-Acting Switches

Open and close circuits quickly to minimize arcing and sticking; often used as door-open indicators

206 products

Switch Mounts

Mount switches to panel cutouts, tank walls, or conveyors

5 products

Photoelectric Switch Reflectors

Pair with sensor switches to reflect light back at them

38 products

Sensor Switch Transmitters

Monitor objects, switch equipment on and off, and send data to control systems with a single device

21 products

Speed-Monitoring Switches

Avoid downtime and machinery damage by detecting slowdowns in drive trains and conveyors

3 products

Tilt Switches

Trip circuits when tilted; use as position indicators, pump level controls, and limit switches

8 products

Safety Switches

Protect people by cutting power to machines when access doors open; also known as interlock switches

59 products

Switch Safety Barriers

Safely send power to switches and sensors in volatile areas such as refineries and power plants

2 products

Switch Mats

Step on a mat to actuate circuits, often to control doors, lights, and alarms

33 products

Finger-Touch Switches

Lightly touch with your finger to turn circuits on and off

26 products

Vibration Switches

Monitor vibration in machinery and shut it down or sound an alarm if levels rise

4 products

Air-Actuated Switches

Press with your hand or foot to turn circuits on and off with air pressure

9 products

Switch Padding

Trigger an emergency stop when robot arms contact a worker or object

4 products

Fingerprint Scanners

Use fingerprints to confirm the identity of personnel before granting access to areas or equipment

2 products

Touch-Pad Switches

Lay flat or mount on a wall to alert you when doors open or objects are removed

2 products

Development Board Sensor Modules

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

17 products

IO Link Programmers

Configure your IO Link devices without a PC, outlet, or separate software

1 product

Multifunction Chemistry Controllers

Use pH or oxidation reduction potential (ORP) levels to turn equipment on or off

7 products

Conductivity Controllers

Turn pumps, mixers, and valves on and off based on a solution’s conductivity

3 products

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

44 products

Monitoring Relays

Trip circuits or sound an alarm when voltage, current, or other limits are exceeded

31 products

Rotary Encoders

Track the distance, direction, and speed of travel of motor shafts, conveyors, and wheels

34 products

Safety Relays

Monitor circuits and force machines to a safe stop if the relay detects a fault

4 products

Air-Actuated Relays

Convert an air signal on a pneumatic control system to an electric one

1 product

Metric Circular Cords

Send power and signal to equipment with metric connections

1 product

Terminal Blocks

Create tidy rows of wire connections that you can identify, test, and adjust on the spot

31 products

Current Conditioners

Lower current flows to levels that work with panel monitors and other electrical measuring equipment

33 products

Wire and Cable Strippers

Remove the outer insulation on wire and cable

2 products

Measuring and Inspecting

Cameras

Capture pictures and video, and then transfer them to your PC or the web

1 product

Machine Vision Cameras

Inspect objects on conveyor lines for defects such as surface flaws and missing screws

17 products

Monoculars

Magnify still objects from far away to view features you couldn't see with the naked eye

1 product

Microscope Eyepiece Cameras

Place over your microscope's eyepiece to view a live feed of extra-fine details

1 product

Equipment Monitoring Cameras

Place inside machines to keep an eye on harsh industrial processes from a safe distance

2 products

Ultraviolet Inspection Lights

Shine on equipment to detect traces left behind by leaks, rodents, and other contaminants

1 product

Optical Comparators

Magnify your part to check for dimensional accuracy and surface defects

19 products

Stud Finders

Pinpoint the location of metal or wood studs in drywall, plywood, and other materials

5 products

Magnetic Particle Flaw Detection Kits

Everything you need to detect imperfections on or below metal surfaces

2 products

Magnetic Yokes

Pair with magnetic particles to find defects on or below metal surfaces

5 products

Signal Output Testers

Check if the signal output of a DC switch is NPN or PNP to know how to wire components

1 product

Multimeter Line Splitters

Use with a multimeter to determine current usage of devices without pulling apart their wires

1 product

Multimeters

Take current, voltage, resistance, and other electrical measurements

5 products

Voltage Detectors

Check for voltage in receptacles, cables, and electrical components

13 products

Current Detectors

Check for AC current and voltage without making direct contact with wire

1 product

Test Leads

Pair with electrical testers such as multimeters to analyze your devices

5 products

Test Lead Sensors

Adapt Fluke multimeters to take temperature readings, so you don't need a separate meter

2 products

Current Indicating Rings

Run wire through rings to monitor AC current flow

5 products

Electrical Resistance Meters

Prevent damage to electronics by checking that surfaces won't discharge static electricity

4 products

Voltage Meters

Measure voltage in electrical components

7 products

Electronic-Component Testers

Test, identify, and troubleshoot components such as circuit boards and diodes

3 products

Combustion Analyzers

Measure boiler and furnace combustion efficiency

3 products

Thermometers

Monitor temperature in tanks, pipes, control panels, and other equipment

517 products

Thermometer Cooling Jackets

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

1 product

Thermometer Air Purges

Blow dust and moisture off infrared thermometer transmitter lenses

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

Temperature and Humidity Meters

Simultaneously measure temperature and relative humidity

13 products

Thermal Cameras

Detect hot spots, leaks, moisture problems, and construction defects invisible to the eye

7 products

Temperature-Indicating Sheets

Stick to surfaces and the color changes as the temperature rises and falls

8 products

Humidity Meters

Measure relative humidity without complex calculations

4 products

Temperature Crayons

Less messy than liquids, draw marks that melt as surfaces reach a specific temperature

75 products

Temperature-Indicating Liquids

Brush onto surfaces and markings melt when they reach a specific temperature

22 products

Humidity-Indicating Cards

Check humidity levels of moisture-sensitive inventory and equipment at a glance

9 products

Humidity-Indicating Plugs

Monitor humidity in sealed containers without opening them, protecting the inside from contamination

6 products

Inertial Measurement Units

Mount to robot arms, cranes, and vehicles to accurately track their movements

1 product

Tachometers

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

50 products

Vibration Meters

Spot-check vibration to gauge the health of your machine

8 products

Vibration Monitors

Mount to your machine to continuously monitor vibration and ensure it stays within the proper range

16 products

Position Indicators

Track components on rotating spindles or lead screws to help adjust machinery quickly and precisely

71 products

Stroboscopes

Shine a bright flashing light at moving belts and pulleys to measure speed and detect wear

23 products

Shaft Alignment Kits

Confirm that shafts are aligned or measure the degree of their misalignment

1 product

Band Saw Blade Alignment Gauges

Keep band saw blades straight between guides

1 product

Levels

Ensure surfaces are completely horizontal or vertical

189 products

Level Mounts

Strap to nonmagnetic surfaces to attach a magnetic level

2 products

Level Vials

Replace vials in levels or equipment

16 products

Load Cells

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

301 products

Load Cell Junction Boxes

Join multiple load cells to combine their weight measurements

2 products

Torque Gauges

Test the accuracy of torque wrenches and screwdrivers

88 products

Torque Gauge Connectors

Replace square-drive connectors on torque gauges

3 products

Force Gauge Grips

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

10 products

Force Gauges

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

133 products

Torque Sensors

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

22 products

Belt Tension Gauges

Check belt tension to minimize vibration, noise, and slippage

16 products

Chemistry Sensors

Pair with chemistry meters to test oxidation reduction potential (ORP) or pH

11 products

Air Particle Counters

Monitor indoor dust levels and measure filter efficiency in HVAC systems

1 product

Chemistry Meters

Take water-chemistry measurements more precisely than test strips and swabs

42 products

Water Test Kits

All the chemicals and labware you need for on-site sampling and water-quality testing

4 products

Moisture Meters

Stick in wood and other building materials to view moisture levels

2 products

Wristwatches

Display the time, date, and smart functions on your wrist and keep your hands free

2 products

Counters

Record and display the number of times events or processes occur

16 products

Data Recorders

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

56 products

Data Recorder Charts

Place in temperature and humidity data recorders to document readings over time

16 products

Magnetic Field Indicators

Measure the strength of a magnetic field in gauss

12 products

Machine Tool Indicator Contact Points

Replace the contact point on your machine tool indicator

3 products

Protractors

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

36 products

Squares

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

115 products

Angle Indicators

Align pipe and other equipment by measuring angle, level, or tilt

24 products

Machine Tool Indicators

Find the exact edge of a workpiece without math or guesswork to quickly align your machining setup

6 products

Combination Square Heads

Attach combination square blades to form a combination square

28 products

Angle Identifiers

Place the edges against fittings, dies, and other objects to quickly verify angles up to 45°

2 products

Combination Square Blades

Connect to a combination square head to create a combination square

17 products

Squareness Gauges

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

3 products

Light Meters

Measure light quality and intensity

20 products

Airflow Meters

Measure airflow in duct, air filters, exhaust hoods, and other air applications

25 products

GPS Navigators

Navigate on foot with real-time GPS data

1 product

Stethoscopes

Detect internal mechanical problems like worn parts, excessive vibration, and fluid leaks

8 products

Leak-Detecting Dyes

Bright colors help you spot leaks in water and hydraulic systems without using ultraviolet light

30 products

Gas Leak Detectors

Find gas leaks in pipes, tubes, fittings, tanks, cylinders, and valves

23 products

Radiation Detectors

Test for radiation, even in low amounts or from microwave ovens

6 products

Leak-Detecting Pipe Flange Covers

Wrap around pipe flanges to show when there's a leak and contain it

33 products

Center Finders

Line up your drill with the center of round bars and pipe

1 product

Straightedges

Draw straight lines and check the straightness of surfaces

5 products

Angle Transfers

Duplicate any angle in construction and other applications

2 products

Straightedge/Protractors

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

2 products

Center Punch/Angle Indicators

Find the center of pipe and other parts and determine setup angles on milling machines and grinders

5 products

Fuel Injection Pressure Testers

Check fuel injection pressure to maintain your car's gas mileage

1 product

Barometers

Measure atmospheric pressure changes

8 products

Compression Testers

Check engine compression to maintain top performance

9 products

Weather Stations

Measure multiple weather conditions at the same time

9 products

Fluid Handling

Pressure Transmitters

Send pressure readings to controllers and remote displays

371 products

Pressure Transmitter Displays

Remotely view pressure readings sent from a transmitter

2 products

Pressure and Vacuum Transmitters

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

98 products

Differential Pressure Sensors

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

5 products

Pressure Gauges

Measure pressure in pumps, filters, regulators, and process lines

5 products

Differential Pressure Transmitters

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

70 products

Pitot Tubes

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

4 products

Pressure Test Gauges

Check and calibrate pressure gauges, transmitters, and equipment to maintain accuracy

614 products

Vacuum Transmitters

Transfer vacuum measurements to remote displays and controllers

17 products

Vacuum Test Gauges

Verify that equipment is taking accurate vacuum measurements

8 products

Thermocouples

Measure and transmit liquid, gas, and surface temperature

720 products

Thermocouple Connectors

Join thermocouple probes and wire to thermometers and control panels

155 products

Thermocouple Transmitters

Check system temperatures from your smartphone or tablet

9 products

Thermocouple Connector Adapters

Convert round-pin male connectors to flat-pin male connectors

10 products

RTDs

Measure and transmit liquid, gas, and surface temperature more precisely than thermocouples

144 products

RTD Transmitters

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

10 products

RTD Connectors

Attach plug-in connectors to RTD probes with wire leads

2 products

Humidistats

Control the humidity in an enclosure or space

6 products

Temperature and Humidity Transmitters

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

3 products

Humidity Controllers

Monitor humidity and control it by automatically turning equipment on and off

2 products

Thermowells

Prevent damage to thermometers and temperature probes in pressurized tanks and pipelines

115 products

Noncontact Temperature Sensors

Monitor the temperature of hazardous, sensitive, and hard-to-reach materials without touching them

21 products

Temperature Switches

Turn heating equipment on or off at a specified temperature

8 products

Thermocouple and RTD Protection Tubes

Shield thermocouple and RTD probes in large, unpressurized tanks

16 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

29 products

Float Switches

Start process equipment such as pumps and motors when the liquid in your tank reaches the float

130 products

Float Switch Relays

Amplify current to actuate equipment that has a higher current rating than your float switch

2 products

Flow Switches

Turn equipment on or off when flow rate reaches a set point

177 products

Paddle Level Switches

Actuate when the paddle stops rotating to indicate the level of dry material

6 products

Flow Transmitters

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

84 products

Liquid-Level Transmitters

Send liquid-level data to logging and monitoring equipment

29 products

Liquid-Level Gauges

Monitor fluid levels in containers

198 products

Water Detectors

Place near tanks, sump pumps, and pipe lines to alert you to water leaks

2 products

Pressure Switches

Activate controls, set off alarms, and power equipment when a set pressure is reached

313 products

Differential Pressure Switches

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

53 products

Vacuum Switches

Activate controls, set off alarms, and power equipment when a set vacuum is reached

27 products

Pressure and Vacuum Switches

Activate controls, set off alarms, and power equipment when a set pressure or vacuum is reached

6 products

Safety Equipment

Oxygen Detectors

Too much or too little oxygen triggers alarms and warning lights

3 products

Multi-Gas Detectors

Monitor air for carbon monoxide and combustible gases including methane, hydrogen, and propane

8 products

Heat Stress Monitors

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

9 products

Hydrogen Detectors

Alarms and lights alert you to the presence of hydrogen

4 products

Carbon Monoxide Detectors

Alarms, lights, or color changes alert you to the presence of carbon monoxide

8 products

Methane Detectors

Alarms and lights alert you to the presence of methane instantly or after a set exposure time

1 product

Carbon Dioxide Meters

Measure and display real-time carbon dioxide levels for indoor ventilation quality

1 product

Propane Detectors

Alarms and lights alert you to the presence of propane instantly or after a set exposure time

1 product

Hydrogen Sulfide Detectors

Alarms and lights alert you to high levels of hydrogen sulfide

6 products

Radiation Dose Meters

Attach to your pocket or nearby objects to track the accumulated radiation you've been exposed to

3 products

Smoke Detectors

Warn people when there's smoke in your facility

21 products

Smoke Detector Test Stations

Test hard-to-reach HVAC smoke detectors from a convenient location

1 product

Heat Detectors

Signal your control panel when the temperature rises above a set level

5 products

Fire Alarms

Alert people to fires with loud warnings

36 products

Fall-Arrest Lanyards

Clip to your harness and an anchor to stop you from hitting the ground if you fall

1 product

Respirator Filter Monitors

Track the quality of incoming air as it travels from your air line to your respirator

6 products

Lighting

Light Switch Sensors

Automatically turn lights on and off when you enter and exit rooms

74 products

Light Switch Sensor Controllers

Turn lights on and off or dim them in unison from a secure Bluetooth network

9 products

Light Switch Sensor Guards

Protect light switch sensors from damage and vandalism

5 products

Ceiling and Wall Lights

Mount to ceilings or walls to light up large spaces

60 products

Security Lights

Deter intruders, improve nighttime visibility, and draw attention to dark areas

12 products

Floodlights

Illuminate large, outdoor spaces with a wide-angle light

1 product

Enclosure Lights

Brighten enclosures and small spaces such as closets and drawers

8 products

Light Bulbs

Standard household, miniature, compact, tubular, ultraviolet, and blacklight bulbs

12 products

Light Poles

Bring light to your parking lot or walkway in minutes

4 products

Landscape Lights

A directed beam of light illuminates paths, signs, flags, and landscape elements

3 products

Workstation Lights

Mount above your workspace to brighten your work and add light where ceiling lights can't reach

1 product

Building and Machinery Hardware

Positioning Arms

Mount and position tools and other small equipment

22 products

Brackets

Connect surfaces in an assembly

64 products

Garage Door Opener Receivers

Wire to automatic overhead door openers to accept signals from remote and keypad transmitters

1 product

Garage Door Opener Transmitters

Send signals to receivers to open and close automatic overhead door openers

8 products

Push-to-Close Latches

Automatically hold doors shut when you push them closed

3 products

Cam Latches

Secure drawers, cabinets, mailboxes, and other enclosures

30 products

Facility and Grounds Maintenance

Faucet Repair Parts

Replace faucet parts such as valves, O-rings, washers, and nuts

14 products

Mirrors

View your reflection or deflect beams from safety barrier switches for a perimeter around machinery

10 products

Metal Detectors

Locate metal underground; screen people for concealed metal objects

5 products

Material Handling

Conveyor Brackets

Mount guide clamps, sensors, drip pans, and other attachments to conveyor frames

8 products

Conveyor Accessory Mounts

Position guides or sensors to the exact spot needed for your conveyor

54 products

Forklift Fork Level Indicators

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

1 product

Fabricating and Machining

3D Printer Probes

Map the ups and downs of print surfaces so printers extrude at the proper height

1 product

3D Printer Extruder Heating Elements

Replace your entire heating element, or switch it out to print at higher speeds or temperatures

1 product

Temperature Sensors for 3D Printer Extruder Heating Elements

Measure heating block temperature and send it to printer controllers

4 products

Fastening and Joining

Screwdriver/Nutdrivers

Quickly switch between driving screws and driving nuts

1 product

Torque Screwdrivers

Apply precise torque as you fasten screws to prevent overtightening

24 products

Socket Adapters

Make your socket more versatile, from converting the drive to limiting torque

2 products

Torque Wrenches

Avoid overtightening and damaging fasteners by applying a specific torque

Heating, Ventilation, and Air Conditioning

Thermostats

Connect to heaters, fans, and air conditioners to control the temperature

2 products

HVAC Switches

Control and monitor airflow in HVAC systems automatically

3 products

HVAC Flame Detectors

Replace flame detectors in HVAC equipment such as furnaces, ovens, water heaters, and boilers

1 product

Fans

Blow and direct air to keep spaces and equipment cool and ventilated

1 product

Exhaust Fans

Draw stagnant and humid air out of a room or area

2 products

Air Filters

Trap dust and debris in HVAC, exhaust, and electronics systems to improve efficiency and air quality

2 products

Communication

Audible Alarms

Everything from bells and whistles to horns and sirens

12 products

Traffic Lights

Signal and direct traffic

2 products

Audible Alarms/Indicator Lights

Alert people with both light and sound

2 products

Labels

Stick onto items to identify or convey information about them

118 products

Power Transmission

Air Cylinders

Push and pull loads to do everything from stamping materials to sorting parts on conveyors

1,781 products

Parts Metering Cylinders

Space out parts to control flow on conveyors and feeders

12 products

Hydraulic Cylinders

Push and pull heavy loads to operate forklifts, compactors, and other machinery

188 products

Stopper Cylinders

Extend to stop loads on a conveyor and retract to let them pass

8 products

Lubricating

Grease Dispenser Monitors

Extend the life of bearings by taking the guesswork out of how much to lubricate them

6 products