Tube Monitors | McMaster-Carr

Add a window to your high-vacuum system. With a pane of borosilicate 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.

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 Sights for High Vacuum

Peer through the glass on these flow sights to see what’s happening in your high-vacuum line.

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 Transmitters for Air

Calibrated for compressed air.

Pressure and Vacuum Transmitters

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.

Sanitary Pressure Transmitters

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

Sanitary Easy-Setup Pressure Transmitters

Used in food-processing and pharmaceutical plants to automatically compensate for temperature changes and errors caused by vibration, these transmitters have a sanitary design certified by 3-A.

Sanitary Easy-Setup Pressure
and Vacuum Transmitters

Designed for sanitary environments, these transmitters automatically compensate for error in vacuum and pressure measurements caused by vibration and temperature fluctuations, so you don’t need to program corrections into your receiving device.

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.

Sanitary Easy-Setup Vacuum Transmitters

Monitor and control equipment in food-processing and pharmaceutical plants—these transmitters convert vacuum into electrical signals for receiving devices and have a 3-A certified sanitary design. They automatically compensate for vibration and temperature changes, saving you the effort of programming manual corrections.

Pressure and Vacuum Gauges

Vibration- and Corrosion-Resistant Pressure Gauges

The case material and connection threads are stainless steel for protection in corrosive environments, plus the dial is glycerin-filled to reduce needle flutter in high-vibration applications.

Differential Pressure and Vacuum
Gauges with Digital Display

Gauges have a digital display for easy reading of measurements.

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.

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.

Flow and Level Monitoring and Control

Sanitary Level Indicators

High-Vacuum Flanged Sights