Sight Glass Gauges | McMaster-Carr

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1,115 Products

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Liquid-Level Gauges

Liquid-Level Indicators

Liquid-Level Indicators with Shut-Off Valve

Stop the flow so you can clean and replace gauge glass without removing the indicator

16 products

Build-Your-Own Liquid-Level Indicators with Shut-Off Valve

Build your own level indicator with valves, gauges, and guard rods

120 products

Oil-Level Indicators

Monitor fluid levels in gear boxes, crank cases, and other reservoirs

122 products

High-Pressure Oil-Level Indicators

Monitor fluid levels in pressurized applications, such as hydraulic systems

91 products

Shatter-Resistant Oil-Level and Temperature Indicators

Monitor fluid level and temperature through a durable nylon window

8 products

Chemical-Level Indicators

Check the level of liquids containing chemicals such as boric acid and sodium bicarbonate

14 products

Flexible Easy-View Liquid-Level Indicators

Bend around the contours of your hydraulic fluid, oil, or water tank

14 products

Easy-View Oil-Level Indicators

Made with clear plastic so you can check fluid levels from any angle

15 products

Heavy Duty Liquid-Level Indicators

Withstand vibration, high pressures, and high temperatures

19 products

High-Pressure Oil-Level and Temperature Indicators

Check the temperature and the fluid level in a pressurized system

33 products

Easy-View High-Pressure Oil-Level Indicators

The nylon body and window resist shattering and allow you to check levels from any angle

7 products

Pop-Up Full-Tank Liquid-Level Indicators

Pop up when your tank is almost full to avoid overfilling

16 products

Oil-Level and Temperature Indicators

Monitor the fluid level and temperature in gear boxes, crank cases, and other reservoirs

14 products

Liquid-Level Gauges

Liquid-Level Gauges for Drums

Measure water, hydraulic fluid, or diesel fuel level in your drum

20 products

Vertical-Mount Liquid-Level Gauges for Tanks

Install through the top of tanks containing water, hydraulic fluid, and diesel

139 products

Vertical-Mount Fuel-Level Gauges for Tanks

Install through the top of your tank to monitor diesel, fuel oil, or gasoline level

37 products

Chemical-Resistant Vertical-Mount Liquid-Level Gauges for Tanks

Stainless steel float and float rod resist corroding from chemicals

23 products

Precision Liquid-Level Gauges for Tanks

Measure levels using inches or centimeters instead of full or empty

7 products

Horizontal-Mount Fuel-Level Gauges for Tanks

Mount on the flat end of a horizontal, cylindrical tank to monitor fuel levels

2 products

Propane Tank Refill Indicator Gauges

Know at a glance if your propane gas supply is running low

1 product

Other Products

Sights

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

243 products

Flow Sights

Visually confirm flow and inspect liquid color and clarity

154 products

Flow Transmitters

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

29 products

Hose Coupling Plugs

Pair with a socket for a complete hose coupling

2 products