Check the level of liquids containing chemicals such as alcohol-based solvents, boric acid, and sodium bicarbonate. These indicators can be used in pressurized applications where overflow is a concern. All have an aluminum gauge shield that protects the glass window from impact. Clear liquids magnify a red line at the back of the window, so their levels are easier to see.

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. All have a one-piece design, so there are no crevices where bacteria can grow. A quick-clamp fitting, gasket, and tube fitting are required (sold separately).

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. They’re often found on gear boxes, crank cases, and other reservoirs. These indicators mount from the outside of your tank. The vent prevents pressure buildup, which can affect the level displayed. Within the vent, there is a filter for keeping out particles as small as table salt. Unthread the vent to clean its filter or to replace it with your own vent, plug, fitting, or sensor. These indicators also have adjustable rings for marking levels critical to your system.