Electronics Sensors | McMaster-Carr

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2,517 Products

Electrical

Sensor Switches

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

604 products

Magnetic Switches

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

59 products

Limit Switches

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

39 products

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

11 products

Sensor Switch Transmitters

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

16 products

Multifunction Chemistry Controllers

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

3 products

Conductivity Controllers

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

2 products

Safety Switches

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

6 products

Snap-Acting Switches

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

4 products

Vibration Switches

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

1 product

Manual Switches

Everything from toggle, push-button, and rocker switches to foot switches

26 products

Relays

Electrically open and close circuits to control power to lights, motors, and other equipment

8 products

Safety Equipment

Oxygen Detectors

Too much or too little oxygen triggers alarms and warning lights

2 products

Multi-Gas Detectors

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

2 products

Heat Stress Monitors

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

4 products

Carbon Monoxide Detectors

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

6 products

Carbon Dioxide Meters

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

1 product

Hydrogen Sulfide Detectors

Alarms and lights alert you to high levels of hydrogen sulfide

6 products

Smoke Detectors

Warn people when there's smoke in your facility

3 products

Respirator Filter Monitors

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

1 product

Measuring and Inspecting

Cameras

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

1 product

Optical Comparators

Magnify your part to check for dimensional accuracy and surface defects

4 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

Electrical Resistance Meters

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

4 products

Multimeters

Take current, voltage, resistance, and other electrical measurements

5 products

Voltage Meters

Measure voltage in electrical components

3 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

Temperature and Humidity Meters

Simultaneously measure temperature and relative humidity

9 products

Thermometers

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

121 products

Thermal Cameras

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

4 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

36 products

Tachometers

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

25 products

Vibration Meters

Spot-check vibration to gauge the health of your machine

3 products

Stroboscopes

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

13 products

Position Indicators

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

5 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

16 products

Moisture Meters

Stick in wood and other building materials to view moisture levels

1 product

GPS Navigators

Navigate on foot with real-time GPS data

1 product

Airflow Meters

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

18 products

Levels

Ensure surfaces are completely horizontal or vertical

15 products

Magnetic Field Indicators

Measure the strength of a magnetic field in gauss

2 products

Light Meters

Measure light quality and intensity

1 product

Torque Gauges

Test the accuracy of torque wrenches and screwdrivers

44 products

Force Gauges

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

51 products

Angle Indicators

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

10 products

Compression Testers

Check engine compression to maintain top performance

1 product

Barometers

Measure atmospheric pressure changes

7 products

Machine Tool Indicators

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

4 products

Protractors

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

4 products

Gas Leak Detectors

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

5 products

Stethoscopes

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

1 product

Radiation Detectors

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

2 products

Weather Stations

Measure multiple weather conditions at the same time

1 product

Fluid Handling

Pressure Transmitters

Send pressure readings to controllers and remote displays

280 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

86 products

Differential Pressure Transmitters

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

70 products

Vacuum Transmitters

Transfer vacuum measurements to remote displays and controllers

14 products

Pressure Test Gauges

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

102 products

Flow Transmitters

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

77 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

7 products

Flow Switches

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

150 products

Humidistats

Control the humidity in an enclosure or space

6 products

Humidity Controllers

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

2 products

Temperature Switches

Turn heating equipment on or off at a specified temperature

7 products

Thermocouple Transmitters

Check system temperatures from your smartphone or tablet

9 products

RTDs

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

7 products

RTD Transmitters

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

7 products

Noncontact Temperature Sensors

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

5 products

Pressure Switches

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

39 products

Pressure and Vacuum Switches

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

3 products

Vacuum Switches

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

4 products

Lighting

Light Switch Sensors

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

19 products

Facility Lights

Illuminate both indoor and outdoor areas with a permanent light source

19 products

Heating, Ventilation, and Air Conditioning

Thermostats

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

1 product

HVAC Switches

Control and monitor airflow in HVAC systems automatically

2 products

Exhaust Fans

Draw stagnant and humid air out of a room or area

2 products

Fastening and Joining

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

35 products

Torque Screwdrivers

Apply precise torque as you fasten screws to prevent overtightening

6 products

Power Transmission

Stopper Cylinders

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

2 products