Easily view liquid movement and level changes from a distance—these sights have an indicator ball inside the glass window.

View tank contents from multiple angles through the plastic domed window.

Continuously monitor oil quality through the clear plastic reservoir, and use the attached drain valve to remove water accumulation.

Often used in kilns and other heating equipment, these sights have a quartz window that can withstand temperatures up to 1600° F. They're also known as peep sights.

Press these sights into a hole in your tank wall; no additional mounting nuts are needed. They mount from the outside.

Monitor food, brewery, chemical, pharmaceutical, and biotech processing lines with these sights that attach to quick-clamp fittings for fast installation and easy removal for cleaning.

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.

The nylon body and window make these indicators shatter resistant.

Made with clear, shatter-resistant plastic, these indicators don't require a shield to protect them like other oil-level indicators, so you can check your hydraulic fluid or oil level from any angle.

Check the level of liquids containing chemicals such as alcohol-based solutions, boric acid, and sodium bicarbonate.

Check both the temperature and the hydraulic fluid or oil level in a pressurized system.

Replace existing gauge glass or combine with valves and guard rods to build your own level indicator.

Combine a pair of valves with a gauge glass and four guard rods to build a complete level indicator.

Seal the glass on your level indicator.

Avoid overfilling—these indicators pop up when your tank is almost full.

Monitor liquid level in applications that have vibration, high pressures, and high temperatures. These indicators are also known as armored level gauges.

For use with water, hydraulic fluid, and diesel, install these gauges through the top of your tank.

Mount these gauges on the flat end of a horizontal, cylindrical tank to monitor diesel fuel, fuel oil, or gasoline level.

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

For visual confirmation of flow from a distance, these sights have a ball indicator that moves when flow is present.

The indicator moves when flow is present, so it’s easy to visually confirm flow from a distance.

A large tubular window provides an unobstructed view of liquid color, clarity, and movement from multiple angles.

Rated for more than double the pressure of standard flow sights, these can withstand pressures up to 400 psi.

Barbed fittings slide into soft plastic and rubber tubing.

About half the height of other flow sights for chemicals, these fit in areas with limited clearance.

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.