Vacuum Instruments | McMaster-Carr

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Less than 250 psi

250 psi to 499 psi

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DFARS Specialty Metals

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About Pressure Gauges

3-in-1 Pressure and Vacuum Gauges

These portable gauges have three different dials to display pressure and vacuum measurements on a low, medium, and high scale.

Digital Pressure and Vacuum Gauges

A digital display allows for easy reading of measurements.

Pressure and Vacuum Gauges

Also known as compound gauges, these measure both pressure and vacuum.

Vibration- and Corrosion-Resistant
Pressure and Vacuum Gauges

Designed for harsh environments prone to vibration, these gauges pair a corrosion-resistant 304 stainless steel case with a glycerin-filled dial that reduces needle flutter.

Corrosion-Resistant Pressure and Vacuum Gauges

A 304 stainless steel case coupled with 316 stainless steel connection threads provide protection from corrosive environments.

Vibration-Resistant Pressure and Vacuum Gauges

A glycerin-filled dial reduces needle flutter for precise readings in high-vibration applications.

Refrigeration Pressure and Vacuum Gauges

Often used with chillers and in refrigeration systems, these gauges display the temperature of ammonia relative to the pressure measurement.

Vacuum Gauges

Use these gauges with vacuum pumps, packaging equipment, and in suction lines to measure and display vacuum.

Hand-Held High-Vacuum Gauges

Check the vacuum levels in high-vacuum pumps, valves, and chambers with this compact gauge.

Vibration-Resistant Vacuum Gauges

A glycerin-filled dial reduces needle flutter for precise readings in high-vibration applications.

Vibration- and Corrosion-Resistant Vacuum Gauges

Designed for harsh environments prone to vibration, these gauges pair a corrosion-resistant 304 stainless steel case with a glycerin-filled dial to reduce needle flutter.

Corrosion-Resistant Vacuum Gauges

The case and connection threads are stainless steel for protection in corrosive environments.

Ultra-Low Vacuum Gauges

Accommodate applications with a vacuum range of -100 in. of H₂O to 0 in. of H₂O.

Differential Pressure and Vacuum
Gauges with Digital Display

Gauges have a digital display for easy reading of measurements.

Differential Pressure and Vacuum Gauges

Commonly used to indicate clogged filters, these gauges display the difference between two pressure or vacuum measurements.

Low-Pressure Differential
Gauges with Digital Display

Gauges have a digital display for easy reading of measurements.

Digital High-Accuracy Pressure Gauges

A digital display allows for easy reading of measurements.

Low-Pressure Differential Gauges with Dial Indicator

Measure small changes in air pressure with these gauges. They are commonly used to indicate clogged filters and to monitor fans and blowers.

Absolute Pressure Gauges

Unlike other gauges that measure the difference between your system and the atmosphere, these give measurements relative to zero pressure.

Pressure and Vacuum Transmitters

Vacuum Transmitters for Compressed Air

Designed for compressed air and gas systems, these transmitters remotely monitor vacuum.

High-Accuracy Vacuum Transmitters

At least four times as accurate as standard vacuum transmitters, these transmitters sense vacuum at an accuracy of ±0.25%, making them ideal for use in laboratories and in analytical testing applications.

Adjustable-Range Vacuum Transmitters

Account for changes in vacuum readings over time by fine-tuning the vacuum range on these transmitters.

Vacuum Transmitters

Convert vacuum into an electrical signal that can be interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls to monitor vacuum or control equipment.

Absolute Pressure Transmitters
for Development Boards

Measure your equipment’s pressure and send the data directly to a development board or single-board computer. Also known as transducers, these transmitters convert pressure into an electrical I²C signal and transmit it to your board.

Adjustable-Range Pressure Transmitters

Fine-tune the pressure range on these transmitters to account for changes in pressure readings over time.

Absolute Pressure Transmitters

Monitor and control pressure in portable HVAC systems, hydraulics, and oil and gas equipment. Unlike other pressure transmitters that measure the difference between your system and the atmosphere, these transmitters give measurements relative to zero pressure—regardless of altitude or temperature.

Easy-Setup Pressure and Vacuum Transmitters

These transmitters automatically compensate for error introduced into both pressure and vacuum measurements by vibrations as well as temperature fluctuations, so you do not need to program corrections for these factors into your receiving device. They convert pressure and vacuum to an electrical signal that can be interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls to monitor pressure or control equipment.

Pressure and Vacuum
Transmitters for Compressed Air

Specifically made for compressed air and gas systems, these transmitters remotely monitor pressure and vacuum.

Pressure and Vacuum Transmitters

Convert both pressure and vacuum into an electrical signal that can be interpreted by receiving devices, such as remote displays, programmable logic controllers, and motor speed controls to monitor pressure or control equipment.

High-Accuracy Pressure and Vacuum Transmitters

With an accuracy of ±0.25%, use these transmitters in applications that require highly accurate measurement of both pressure and vacuum, such as activating vacuum pumps.

Pressure and Vacuum
Transmitters with Digital Display

Monitor and control vacuum pumps, air compressors, and hydraulics while viewing readings and warnings on the display.

Hazardous Location Easy-Setup
Pressure and Vacuum Transmitters

Used in hazardous locations, these transmitters safely convert pressure and vacuum into an electrical signal to measure liquids, gases, and steam. NEC rated for safety, these transmitters are explosion proof, so they can be used in environments containing flammable gases and vapors.

Remote Displays for Pressure Transmitters

Monitor pressure in your system from a distance by using this display in conjunction with pressure transmitters.

Differential Pressure Transmitters
with Dial Indicator for Air

Check the difference in air pressure between two inputs at the source using the dial indicator or remotely using a receiver.

Test Gauges for Vacuum

Use these gauges to test and calibrate transmitters, gauges, and other equipment that measures vacuum.

Differential Pressure Switches with Dial Indicator for Air

Differential Pressure Switches
with Dial Indicator for Air

Troubleshoot and monitor the difference in air pressure between two points—these switches have a dial indicator to show differential pressure in real time.

Oil-Free Electric High-Vacuum Pumps

Connect these pumps to a vacuum chamber to create high levels of vacuum—just plug them in and they’re ready to go. Since they don’t use oil, they won’t introduce contaminants into your system.