Tube Monitors | McMaster-Carr

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	For Use With For Use With

	Connection Style Connection Style

	System of Measurement System of Measurement

Inch

	Connection Type Connection Type	Show

Tube

	Connection Type Connection Type	Hide

	Scale Scale

	Measures Measures

Differential Pressure

Differential Vacuum

Pressure

Vacuum

	Display Type Display Type


Digital	Scale

Dial	U-Tube

Inclined Scale

	Maximum Pressure Maximum Pressure

	For Tube OD For Tube OD

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Connection Material Connection Material

Stainless Steel

Brass

Plastic

	Environment Environment

High-Pressure Washdown

	Maximum Pressure, in. of H2O Maximum Pressure, in. of H2O

	Maximum Flow Maximum Flow

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	Specifications Met Specifications Met

3-A Sanitary Certified

	Maximum Process Temperature Maximum Process Temperature

	Maximum Temperature Maximum Temperature

	Dial Type Dial Type


Dry	Liquid Filled

	Dial Diameter Dial Diameter

2 1/2"

3 1/2"

	Connection Location Connection Location

	Bottom

	Height Height

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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114 Products

About Pressure Gauges

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.

Pressure Transmitters for Compressed Air

With a pressure range common to most compressed air systems, use these transmitters to monitor your system's air pressure.

Sanitary Pressure Transmitters

For use in sanitary applications such as food processing, these transmitters are 3-A certified.

Pressure and Vacuum Transmitters for Compressed Air

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

Vacuum Transmitters for Compressed Air

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

Low-Pressure Differential Pressure Transmitters

Often used in HVAC systems and clean room airflow monitoring applications, these transmitters measure the difference in pressure between two low-pressure process lines.

Pressure and Vacuum Gauges

Low-Pressure Differential Gauges with U-Tube

Also known as manometers, these gauges come with indicating liquid that moves up and down two columns—the difference in height between them is your pressure.

Low-Pressure Differential Gauges with Digital Display

Gauges have a digital display for easy reading of measurements.

Low-Pressure Differential Gauges with Inclined Scale

Easier to read than U-tube gauges, these use an inclined scale to measure pressure or velocity changes in air applications. They are also known as manometers.

Vibration-Resistant Food and
Beverage Pressure Gauges

A liquid-filled dial reduces needle flutter in high-vibration food-processing applications.

Food and Beverage Pressure Gauges

These gauges are 3-A certified for sanitary design in dairy and other food processing applications.

Differential Pressure and Vacuum
Gauges with Digital Display

Gauges have a digital display for easy reading of measurements.

Flow and Level Monitoring and Control

Flowmeters for Oxygen

Calibrated, cleaned, and bagged for oxygen service, these flowmeters are commonly used for welding.

Flowmeter/Totalizers for Water and Chemicals

To withstand water and a variety of caustic chemicals, these flowmeter/totalizers have a corrosion-resistant 316 stainless steel body.

Flow Sights with Barbed Fittings
for Water, Oil, Air, and Inert Gas

Barbed fittings slide into soft plastic and rubber tubing.

Flow Sights for Food and Beverage

Made of FDA-listed materials, these sights can be used with food and beverage. They have sanitary quick-clamp connections for easy disassembly and cleaning.

Flow Transmitters for Air

Calibrated for compressed air.

High-Vacuum Flanged Sights

Add a window to your high-vacuum system. With a pane of glass sealed inside a high-vacuum CF flange, these sights bolt onto vacuum chambers, tee fittings, and manifolds.

High-Vacuum Sights for Quick-Clamp Fittings

Designed with quick-clamp (KF) connections, these sights connect to a port on a high-vacuum chamber, so you can monitor what's happening inside.