Monitors | McMaster-Carr

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15,412 Products

Most Likely Products

Positioning Arms

Positioning Arms

Mount and position tools, small electronics, and displays

Oxygen Detectors

Oxygen Detectors

Too much or too little oxygen triggers alarms and warning lights

Carbon Dioxide Meters

Carbon Dioxide Meters

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

T-Slotted Framing Mounts

T-Slotted Framing Mounts

Connect tubes, switches, casters, and other components to T-slotted rails

Wristwatches

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

All Results

Building and Machinery Hardware

Positioning Arms

Positioning Arms

Mount and position tools, small electronics, and displays

Monitor Stands

Support a monitor at viewing height

Positioning Arm Mounts

Positioning Arm Mounts

Add a mounting surface to positioning arms

T-Slotted Framing Mounts

T-Slotted Framing Mounts

Connect tubes, switches, casters, and other components to T-slotted rails

Garage Door Opener Receivers

Garage Door Opener Receivers

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

Garage Door Opener Transmitters

Garage Door Opener Transmitters

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

Brackets

Connect surfaces in an assembly

Cam Latches

Secure drawers, cabinets, mailboxes, and other enclosures

Safety Equipment

Oxygen Detectors

Oxygen Detectors

Too much or too little oxygen triggers alarms and warning lights

Carbon Dioxide Meters

Carbon Dioxide Meters

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

Multi-Gas Detectors

Multi-Gas Detectors

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

Carbon Monoxide Detectors

Carbon Monoxide Detectors

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

Hydrogen Sulfide Detectors

Hydrogen Sulfide Detectors

Alarms and lights alert you to high levels of hydrogen sulfide

Heat Stress Monitors

Heat Stress Monitors

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

Hydrogen Detectors

Hydrogen Detectors

Alarms and lights alert you to the presence of hydrogen

Sound Level Monitors

Sound Level Monitors

Continuously measure ambient sound levels to confirm they fall within your programmed thresholds

Methane Detectors

Methane Detectors

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

Propane Detectors

Propane Detectors

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

Smoke Detectors

Smoke Detectors

Warn people when there's smoke in your facility

Smoke Detector Test Stations

Smoke Detector Test Stations

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

Heat Detectors

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

Blood Pressure Monitors

Blood Pressure Monitors

Take and store precise blood pressure and pulse rate readings

Measuring and Inspecting

Voltage Detectors

Voltage Detectors

Check for voltage in receptacles, cables, and other electrical components

Electrical Panel Meters

Electrical Panel Meters

See the amount of electricity used to run motors, generators, and other equipment

Multimeters

Take current, voltage, resistance, and other electrical measurements

Multimeter Line Splitters

Multimeter Line Splitters

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

Multimeter Hangers

Multimeter Hangers

Free up your hands when using a Fluke multimeter

Meter Computer Connectors

Meter Computer Connectors

Plug into a computer to receive and analyze measurements from a Fluke wireless meter

Oscilloscopes

Analyze problems with electrical equipment by graphing voltage and other electrical waveforms

Current Meters

Measure current without interrupting the circuit

Current Indicating Rings

Current Indicating Rings

Run wire through rings to monitor AC current flow

Power Consumption Data Loggers

Power Consumption Data Loggers

Record data to monitor energy usage and fix intermittent problems, such as voltage spikes

Current Detectors

Current Detectors

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

Electrical Monitor Calibrators

Electrical Monitor Calibrators

Check the accuracy of electrical sensors and measuring instruments

Motor Phase Sequence Testers

Motor Phase Sequence Testers

Analyze a motor's rotation and electrical system to confirm proper wiring

Battery Testers

Battery Testers

Measure the health of rechargeable batteries, or check if it's time to replace disposable batteries

Battery Discharge Indicators

Battery Discharge Indicators

Install on lift trucks and other electric vehicles to display battery condition

Signal Output Testers

Signal Output Testers

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

Electronic-Component Testers

Electronic-Component Testers

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

Shunts

Measure the current flowing through a circuit when the current is too high to only use a meter

Electrical Resistance Meters

Electrical Resistance Meters

Prevent damage to electronics by checking material and surfaces for static discharge

Oscilloscope/Multimeters

Oscilloscope/Multimeters

Perform electrical tests, record data, and view a graph of electrical waveforms

Test Leads

Pair with electrical testers such as multimeters to analyze your devices

Test Lead Sensors

Test Lead Sensors

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

Voltage Meters

Measure voltage in electrical components

Wristwatches

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

Temperature and Humidity Meters

Temperature and Humidity Meters

Simultaneously measure temperature and relative humidity

Combustion Analyzers

Combustion Analyzers

Measure boiler and furnace combustion efficiency

Thermometers

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

Thermometer Cooling Jackets

Thermometer Cooling Jackets

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

Thermometer Air Purges

Thermometer Air Purges

Blow dust and moisture off infrared thermometer transmitter lenses

Thermometer Insulating Tubes

Thermometer Insulating Tubes

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

Thermometer Covers

Thermometer Covers

Prevent dirt buildup on infrared thermometer transmitters

Thermal Cameras

Thermal Cameras

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

Humidity Meters

Humidity Meters

Measure relative humidity without complex calculations

Temperature-Indicating Sheets

Temperature-Indicating Sheets

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

Temperature Crayons

Temperature Crayons

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

Temperature-Indicating Liquids

Temperature-Indicating Liquids

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

Humidity-Indicating Cards

Humidity-Indicating Cards

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

Humidity-Indicating Plugs

Humidity-Indicating Plugs

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

Air Particle Counters

Air Particle Counters

Monitor indoor dust levels and measure filter efficiency in HVAC systems

Chemistry Meters

Chemistry Meters

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

Chemistry Sensors

Chemistry Sensors

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

Water Test Kits

Water Test Kits

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

Moisture Meters

Moisture Meters

Stick in wood and other building materials to view moisture levels

Water Test Strips

Water Test Strips

Dip into water and a color change indicates chemicals, pH, and other conditions

Concentration Meters

Concentration Meters

Measure the concentration of solutions; also known as refractometers

pH Testing Paper

pH Testing Paper

Check pH levels without a meter

Radiation Detectors

Radiation Detectors

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

Gas Leak Detectors

Gas Leak Detectors

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

Leak-Detecting Dyes

Leak-Detecting Dyes

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

Leak-Detecting Pipe Flange Covers

Leak-Detecting Pipe Flange Covers

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

Airflow Meters

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

Calibration Columns

Calibration Columns

Calibrate the flow rate of metering pumps

Tachometers

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

Vibration Meters

Vibration Meters

Spot-check vibration to gauge the health of your machine

Inertial Measurement Units

Inertial Measurement Units

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

Vibration Monitors

Vibration Monitors

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

Stroboscopes

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

Force Gauges

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

Force Gauge Grips

Force Gauge Grips

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

Torque Gauge Connectors

Torque Gauge Connectors

Replace square-drive connectors on torque gauges

Torque Gauges

Test the accuracy of torque wrenches and screwdrivers

Load Cell Displays

Load Cell Displays

Connect to load cells to view weight measurements

Load Cells

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

Load Cell Junction Boxes

Load Cell Junction Boxes

Join multiple load cells to combine their weight measurements

Torque Sensors

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

Center Finders

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

Angle Transfers

Angle Transfers

Duplicate any angle in construction and other applications

Center Punch/Angle Indicators

Center Punch/Angle Indicators

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

Straightedge/Protractors

Straightedge/Protractors

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

Sound Level Meters

Sound Level Meters

Measure noise levels to determine if an area requires hearing protection

Stethoscopes

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

Machine Vision Cameras

Machine Vision Cameras

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

Angle Indicators

Angle Indicators

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

Microscopes

Enlarge the view of small parts and samples for inspection and assembly

Squares

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

Protractors

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

Monoculars

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

Angle Identifiers

Angle Identifiers

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

Machine Tool Indicator Contact Points

Machine Tool Indicator Contact Points

Replace the contact point on your machine tool indicator

Machine Tool Indicators

Machine Tool Indicators

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

Magnifiers

Workstation, hand-held, headband, and eyeglass magnifiers

Stud Finders

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

Combination Square Heads

Combination Square Heads

Attach combination square blades to form a combination square

Combination Square Blades

Combination Square Blades

Connect to a combination square head to create a combination square

Counters

Record and display the number of times events or processes occur

Weather Stations

Weather Stations

Measure multiple weather conditions at the same time

Barometers

Measure atmospheric pressure changes

Tire Gauges

Check tire pressure

Tire Pressure Test Gauges

Tire Pressure Test Gauges

Calibrate the accuracy of tire pressure and tire inflation gauges

Density Meters

Measure the density of liquids to check concentration; test battery fluid for a charge

Data Recorder Charts

Data Recorder Charts

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

Data Recorders

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

Magnetic Field Indicators

Magnetic Field Indicators

Measure the strength of a magnetic field in gauss

Passivation Testers

Passivation Testers

Detect iron in stainless steel parts to confirm they're properly passivated

Light Meters

Measure light quality and intensity

Levels

Ensure surfaces are completely horizontal or vertical

Laser Levels

Project level references onto surfaces when installing drop ceilings, pipe, or conveyors

Level Mounts

Strap to nonmagnetic surfaces to attach a magnetic level

Gloss Meters

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

Communication

Monitor Covers

Slip over your monitor to protect it from dust when not in use

Screen Privacy Filters

Screen Privacy Filters

Darken your computer screen when viewed from the sides so it's only visible to you

Display Screens

Display Screens

Display text, numbers, symbols, and other information from your electronics

Traffic Lights

Signal and direct traffic

Audible Alarms

Everything from bells and whistles to horns and sirens

Labels

Stick onto items to identify or convey information about them

Fluid Handling

Pressure Transmitters

Pressure Transmitters

Send pressure readings to controllers and remote displays

Pressure and Vacuum Transmitters

Pressure and Vacuum Transmitters

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

Vacuum Transmitters

Vacuum Transmitters

Transfer vacuum measurements to remote displays and controllers

Pressure Gauges

Pressure Gauges

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

Differential Pressure Gauges

Differential Pressure Gauges

Display the difference in pressure between two points in your air and fluid systems

Vacuum Test Gauges

Vacuum Test Gauges

Verify that equipment is taking accurate vacuum measurements

Differential Pressure and Vacuum Gauges

Differential Pressure and Vacuum Gauges

Show changes in pressure and vacuum to monitor fans, blowers, and filters

Differential Pressure Transmitters

Differential Pressure Transmitters

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

Pressure Test Gauges

Pressure Test Gauges

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

Pressure and Vacuum Gauges

Pressure and Vacuum Gauges

Measure pressure and vacuum in air and fluid lines, pumps, and refrigeration systems

Thermocouple Transmitters

Thermocouple Transmitters

Check system temperatures from your smartphone or tablet

Thermocouples

Measure and transmit liquid, gas, and surface temperature

Thermocouple Connectors

Thermocouple Connectors

Join thermocouple probes and wire to thermometers and control panels

Thermocouple Connector Adapters

Thermocouple Connector Adapters

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

Humidistats

Control the humidity in an enclosure or space

RTDs

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

RTD Transmitters

RTD Transmitters

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

RTD Connectors

Attach plug-in connectors to RTD probes with wire leads

Temperature and Humidity Transmitters

Temperature and Humidity Transmitters

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

Humidity Controllers

Humidity Controllers

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

Thermocouple and RTD Protection Tubes

Thermocouple and RTD Protection Tubes

Shield thermocouple and RTD probes in large, unpressurized tanks

Thermowells

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

Noncontact Temperature Sensors

Noncontact Temperature Sensors

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

Flow Transmitters

Flow Transmitters

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

Liquid-Level Gauges

Liquid-Level Gauges

Monitor fluid levels in containers

Gauge Glass

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

Sights

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

Flowmeters

Measure the flow rate of a liquid or gas

Flow Sights

Visually confirm flow and inspect liquid color and clarity

Liquid-Level Transmitters

Liquid-Level Transmitters

Send liquid-level data to logging and monitoring equipment

Water Detector Sensors

Water Detector Sensors

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

Float Switches

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

Float Switch Relays

Float Switch Relays

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

Level Sensor Switches

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

Flow Switches

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

Paddle Level Switches

Paddle Level Switches

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

Differential Pressure Switches

Differential Pressure Switches

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

Electrical

Current Relays

Prevent AC current overload in equipment such as motors and heaters

Relays

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

Motor Voltage Monitors

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

Speed-Monitoring Switches

Speed-Monitoring Switches

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

Development Board Sensor Modules

Development Board Sensor Modules

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

Sensor Switches

Sensor Switches

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

Photoelectric Switch Reflectors

Photoelectric Switch Reflectors

Pair with sensor switches to reflect light back at them

Rotary Encoders

Rotary Encoders

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

Conductivity Controllers

Conductivity Controllers

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

Multifunction Chemistry Controllers

Multifunction Chemistry Controllers

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

Switch Mounts

Mount sensor switches to panel cutouts, tank walls, or conveyors

Snap-Acting Switches

Snap-Acting Switches

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

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

Light Switch Sensors

Light Switch Sensors

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

Tilt Switches

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

Vibration Switches

Vibration Switches

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

Limit Switches

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

Disconnect Switches

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

Magnetic Switches

Magnetic Switches

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

Electrical Adapters

Electrical Adapters

Change electrical connectors to another type, size, or gender

Electrical Plugs

Electrical Plugs

Pair with sockets or receptacles to transmit power or data

Electrical Sockets

Electrical Sockets

Pair with plugs or receptacles to transmit power or data

Terminal Blocks

Terminal Blocks

Mate with terminals to complete circuits in control panels, motors, and small machines

Thermistor Sensors

Thermistor Sensors

Pair with temperature controllers to check the temperature of devices and maintain ideal conditions

Current Conditioners

Current Conditioners

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

Monitor Enclosures

Monitor Enclosures

Shield displays and televisions from impact, dust, and splashing liquids

Power Supplies

Convert your facility's AC voltage to power equipment that runs on DC voltage

Battery Surge Protectors/Charge Monitors

Battery Surge Protectors/Charge Monitors

Display the charge level of a large-cell battery while protecting it from power surges

Facility and Grounds Maintenance

Computer Screen Cleaners

Computer Screen Cleaners

Wipe dust and dirt from computer screens, then dry them for a streak-free clean

Metal Detectors

Metal Detectors

Locate metal underground; screen people for concealed metal objects

Containers, Storage, and Furniture

Computer Holders

Computer Holders

Save surface space by mounting computers to the underside of desks

Multimeter Cases

Multimeter Cases

Store and carry multimeters

Density Meter Jars

Density Meter Jars

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

Lubricating

Grease Guns

Manually inject lubrication through grease fittings on equipment and machinery

Grease Dispenser Monitors

Grease Dispenser Monitors

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

Fabricating and Machining

Temperature Sensors for 3D Printer Extruder Heating Elements

Temperature Sensors for 3D Printer Extruder Heating Elements

Measure heating block temperature and send it to printer controllers

Material Handling

Robot Safety Padding

Robot Safety Padding

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

Conveyor Accessory Mounts

Conveyor Accessory Mounts

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

Heating, Ventilation, and Air Conditioning

Air Filters

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

HVAC Switches

Control and monitor airflow in HVAC systems automatically

Exhaust Fans

Draw stagnant and humid air out of a room or area

HVAC Flame Detectors

HVAC Flame Detectors

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

Fastening and Joining

Screwdrivers

Tighten and loosen screws

Socket Adapters

Socket Adapters

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

Torque Wrenches

Torque Wrenches

Avoid overtightening and damaging fasteners by applying a specific torque

Lighting

Portable Work Lights

Portable Work Lights

Bring lighting to poorly lit or completely dark areas

Facility Lights

Facility Lights

Illuminate both indoor and outdoor areas with a permanent light source

Sealing

Gauge Glass Gaskets

Gauge Glass Gaskets

Seal the glass on level indicators to monitor liquids without leaks

The quick brown fox jumped over the lazy dog. Pedestal (35" Ht. x 4" Wd. x 4" Dp.)