Monitors | McMaster-Carr

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Alcohol-Based Solvents

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UN/UNF (SAE Straight)

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Centimeters of Mercury

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Less than 500° F

500° F to 999.9° F

1,000° F to 1,999.9° F

2,000° F to 2,999.9° F

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1/2" Circular Connector

Flat-Pin Mini Thermocouple Connector

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16,036 Products

Most Likely Products

Positioning Arms

Mount and position tools, small electronics, and displays

251 products

Oxygen Detectors

Too much or too little oxygen triggers alarms and warning lights

2 products

Carbon Dioxide Meters

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

1 product

T-Slotted Framing Mounts

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

20 products

Wristwatches

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

2 products

All Results

Safety Equipment

Oxygen Detectors

Too much or too little oxygen triggers alarms and warning lights

2 products

Carbon Dioxide Meters

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

1 product

Multi-Gas Detectors

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

3 products

Carbon Monoxide Detectors

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

4 products

Hydrogen Sulfide Detectors

Alarms and lights alert you to high levels of hydrogen sulfide

2 products

Heat Stress Monitors

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

4 products

Hydrogen Detectors

Alarms and lights alert you to the presence of hydrogen

2 products

Methane Detectors

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

1 product

Sound Level Monitors

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

2 products

Propane Detectors

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

1 product

Smoke Detectors

Warn people when there's smoke in your facility

7 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

4 products

Blood Pressure Monitors

Take and store precise blood pressure and pulse rate readings

1 product

Respirator Filter Monitors

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

2 products

Building and Machinery Hardware

Positioning Arms

Mount and position tools, small electronics, and displays

251 products

Monitor Stands

Support a monitor at viewing height

6 products

Positioning Arm Mounts

Add a mounting surface to positioning arms

4 products

T-Slotted Framing Mounts

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

20 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

Brackets

Connect surfaces in an assembly

64 products

Cam Latches

Secure drawers, cabinets, mailboxes, and other enclosures

16 products

Measuring and Inspecting

Voltage Detectors

Check for voltage in receptacles, cables, and electrical components

13 products

Electrical Panel Meters

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

84 products

Multimeters

Take current, voltage, resistance, and other electrical measurements

108 products

Multimeter Line Splitters

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

1 product

Multimeter Hangers

Free up your hands when using a Fluke multimeter

1 product

Meter Computer Connectors

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

1 product

Oscilloscopes

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

1 product

Power Consumption Data Loggers

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

4 products

Current Indicating Rings

Run wire through rings to monitor AC current flow

5 products

Current Meters

Measure current without interrupting the circuit

3 products

Electrical Monitor Calibrators

Check the accuracy of electrical sensors and measuring instruments

1 product

Oscilloscope/Multimeters

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

4 products

Current Detectors

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

1 product

Motor Phase Sequence Testers

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

1 product

Battery Testers

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

6 products

Battery Discharge Indicators

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

3 products

Electronic-Component Testers

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

4 products

Decade Boxes

Test and troubleshoot circuits without needing to solder capacitors or replace resistors

2 products

Shunts

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

5 products

Electrical Resistance Meters

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

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

Test Leads

Pair with electrical testers such as multimeters to analyze your devices

6 products

Test Lead Sensors

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

2 products

Voltage Meters

Measure voltage in electrical components

7 products

Wristwatches

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

2 products

Combustion Analyzers

Measure boiler and furnace combustion efficiency

1 product

Thermometers

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

513 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

Thermal Cameras

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

6 products

Temperature and Humidity Meters

Simultaneously measure temperature and relative humidity

13 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

21 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

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

24 products

Chemistry Sensors

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

11 products

pH Testing Paper

Check pH levels without a meter

9 products

Water Test Kits

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

18 products

Moisture Meters

Stick in wood and other building materials to view moisture levels

1 product

Water Test Strips

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

20 products

Concentration Meters

Measure the concentration of solutions; also known as refractometers

9 products

Airflow Meters

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

21 products

Load Cell Displays

Connect to load cells to view weight measurements

1 product

Load Cell Junction Boxes

Join multiple load cells to combine their weight measurements

2 products

Load Cells

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

302 products

Force Gauges

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

117 products

Force Gauge Grips

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

10 products

Torque Gauge Connectors

Replace square-drive connectors on torque gauges

3 products

Torque Gauges

Test the accuracy of torque wrenches and screwdrivers

80 products

Torque Sensors

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

16 products

Calibration Columns

Calibrate the flow rate of metering pumps

14 products

Squares

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

125 products

Angle Indicators

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

24 products

Combination Square Heads

Attach combination square blades to form a combination square

28 products

Protractors

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

34 products

Combination Square Blades

Connect to a combination square head to create a combination square

18 products

Angle Identifiers

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

2 products

Machine Tool Indicator Contact Points

Replace the contact point on your machine tool indicator

2 products

Machine Tool Indicators

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

6 products

Tachometers

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

26 products

Inertial Measurement Units

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

1 product

Vibration Meters

Spot-check vibration to gauge the health of your machine

6 products

Vibration Monitors

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

10 products

Stroboscopes

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

13 products

Radiation Detectors

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

5 products

Gas Leak Detectors

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

23 products

Leak-Detecting Dyes

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

27 products

Leak-Detecting Pipe Flange Covers

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

40 products

Center Finders

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

1 product

Angle Transfers

Duplicate any angle in construction and other applications

2 products

Center Punch/Angle Indicators

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

3 products

Straightedge/Protractors

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

2 products

Sound Level Meters

Measure noise levels to determine if an area requires hearing protection

4 products

Stethoscopes

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

8 products

Machine Vision Cameras

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

19 products

Microscopes

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

18 products

Monoculars

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

1 product

Magnifiers

Workstation, hand-held, headband, and eyeglass magnifiers

2 products

Stud Finders

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

4 products

Optical Comparators

Magnify your part to check for dimensional accuracy and surface defects

4 products

Microscope Eyepiece Cameras

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

1 product

Counters

Record and display the number of times events or processes occur

100 products

Weather Stations

Measure multiple weather conditions at the same time

3 products

Levels

Ensure surfaces are completely horizontal or vertical

191 products

Data Recorders

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

56 products

Density Meters

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

42 products

Magnetic Field Indicators

Measure the strength of a magnetic field in gauss

11 products

Laser Levels

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

20 products

Data Recorder Charts

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

16 products

Level Mounts

Strap to nonmagnetic surfaces to attach a magnetic level

1 product

Level Vials

Replace vials in levels or equipment

19 products

Passivation Testers

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

Tire Pressure Test Gauges

Calibrate the accuracy of tire pressure and tire inflation gauges

1 product

Barometers

Measure atmospheric pressure changes

8 products

Fuel Injection Pressure Testers

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

1 product

Light Meters

Measure light quality and intensity

18 products

Gloss Meters

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

2 products

Communication

Computer Monitors

Display information in tough conditions such as on factory floors and outdoor jobsites

9 products

Monitor Covers

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

5 products

Screen Privacy Filters

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

3 products

Display Screens

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

27 products

Labels

Stick onto items to identify or convey information about them

126 products

Traffic Lights

Signal and direct traffic

1 product

Audible Alarms

Everything from bells and whistles to horns and sirens

8 products

Audible Alarms/Indicator Lights

Alert people with both light and sound

1 product

Electrical

Power Supplies

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

30 products

Current Relays

Prevent AC current overload in equipment such as motors and heaters

5 products

Relays

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

27 products

Speed-Monitoring Switches

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

1 product

Development Board Sensor Modules

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

13 products

Tablets

Tough enough to withstand drops, grime, and heavy use

5 products

Sensor Switches

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

612 products

Photoelectric Switch Reflectors

Pair with sensor switches to reflect light back at them

38 products

Rotary Encoders

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

10 products

Motor Voltage Monitors

Protect electric motors by cutting power when faults occur

4 products

Light Switch Sensors

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

75 products

Switch Mounts

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

5 products

Snap-Acting Switches

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

180 products

Light Curtains

Immediately cut power to machinery when anything blocks the light beam

23 products

Tilt Switches

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

8 products

Vibration Switches

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

4 products

Limit Switches

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

149 products

Conductivity Controllers

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

1 product

Multifunction Chemistry Controllers

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

2 products

Disconnect Switches

Make sure equipment stays turned off during inspection and maintenance

8 products

Magnetic Switches

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

61 products

Computers

Sturdy and reliable for harsh industrial jobsites, from frigid freezers to sweltering foundries

5 products

Sensor Switch Transmitters

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

13 products

Electrical Adapters

Change electrical connectors to another type, size, or gender

47 products

Terminal Blocks

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

23 products

Electrical Plugs

Pair with sockets or receptacles to transmit power or data

12 products

Electrical Sockets

Pair with plugs or receptacles to transmit power or data

13 products

Monitor Enclosures

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

16 products

Current Conditioners

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

33 products

Battery Surge Protectors/Charge Monitors

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

1 product

Fluid Handling

Pressure Transmitters

Send pressure readings to controllers and remote displays

370 products

Pressure Transmitter Displays

Remotely view pressure readings sent from a transmitter

2 products

Vacuum Transmitters

Transfer vacuum measurements to remote displays and controllers

16 products

Pressure and Vacuum Transmitters

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

97 products

Pressure Gauges

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

290 products

Differential Pressure Gauges

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

41 products

Differential Pressure and Vacuum Gauges

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

8 products

Vacuum Test Gauges

Verify that equipment is taking accurate vacuum measurements

8 products

Pressure Test Gauges

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

60 products

Pressure and Vacuum Gauges

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

42 products

Differential Pressure Transmitters

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

70 products

Flow Transmitters

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

84 products

Liquid-Level Gauges

Monitor fluid levels in containers

574 products

Gauge Glass

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

129 products

Flowmeters

Measure the flow rate of a liquid or gas

1,016 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

Sights

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

231 products

Water Detector Sensors

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

1 product

Float Switches

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

122 products

Float Switch Relays

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

2 products

Level Sensor Switches

Activate equipment by detecting the liquid level in a tank

25 products

Flow Switches

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

173 products

Paddle Level Switches

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

6 products

RTDs

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

134 products

RTD Transmitters

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

10 products

Thermocouples

Measure and transmit liquid, gas, and surface temperature

719 products

Thermocouple Transmitters

Check system temperatures from your smartphone or tablet

9 products

RTD Connectors

Attach plug-in connectors to RTD probes with wire leads

2 products

Thermocouple Connectors

Join thermocouple probes and wire to thermometers and control panels

145 products

Humidistats

Control the humidity in an enclosure or space

6 products

Thermocouple Connector Adapters

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

10 products

Humidity Controllers

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

2 products

Thermocouple and RTD Protection Tubes

Shield thermocouple and RTD probes in large, unpressurized tanks

16 products

Temperature and Humidity Transmitters

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

3 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

22 products

Differential Pressure Switches

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

53 products

Facility and Grounds Maintenance

Computer Screen Cleaners

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

1 product

Metal Detectors

Locate metal underground; screen people for concealed metal objects

2 products

Containers, Storage, and Furniture

Computer Holders

Save surface space by mounting computers to the underside of desks

1 product

Multimeter Cases

Store and carry multimeters

9 products

Density Meter Jars

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

6 products

Material Handling

Robot Safety Padding

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

6 products

Conveyor Accessory Mounts

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

48 products

Forklift Fork Level Indicators

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

1 product

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

Tighten and loosen screws

26 products

Lubricating

Grease Guns

Manually inject lubrication through grease fittings on equipment and machinery

4 products

Grease Dispenser Monitors

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

1 product

Heating, Ventilation, and Air Conditioning

Air Filters

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

2 products

HVAC Switches

Control and monitor airflow in HVAC systems automatically

3 products

Exhaust Fans

Draw stagnant and humid air out of a room or area

2 products

HVAC Flame Detectors

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

1 product

Fabricating and Machining

Temperature Sensors for 3D Printer Extruder Heating Elements

Measure heating block temperature and send it to printer controllers

2 products

Lighting

Facility Lights

Illuminate both indoor and outdoor areas with a permanent light source

8 products

Sealing

Gauge Glass Gaskets

Seal the glass on level indicators to monitor liquids without leaks

14 products