These indicators mount from the outside of your tank.

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

Shut-off valves stop flow so you can clean and replace gauge glass without removing these indicators from your equipment.

The nylon body and window make these indicators shatter resistant.

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

Use this gauge glass with armored flat-glass liquid-level gauges.

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

Machined from one piece of stain- and impact-resistant plastic.

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

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

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 borosilicate glass sealed inside a high-vacuum CF flange, these sights bolt onto vacuum chambers, tee fittings, and manifolds.