The window and body are made from a single piece of plastic, making these sights more shatter resistant than sights with a 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.

Mount these sights from the inside of your tank and secure with a lock nut.

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.

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.

Monitor hydraulic fluid or oil level in pressurized applications.

These flexible indicators bend to follow the contours of a tank.

Mount these indicators from the inside of your tank through unthreaded holes.

Simultaneously monitor hydraulic fluid or oil level and temperature in gear boxes, crank cases, and other reservoirs.

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.

Use these gaskets with heavy duty level indicators to seal the glass.

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

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

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.

Withstand twice the temperature of standard sights. These are rated for temperatures up to 400° F.

Barbed fittings slide into soft plastic and rubber tubing.

Built to withstand harsh chemicals.

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.