The Grainger website offers a variety of liquid level gauges for drums and tanks. These gauges allow users to visually check liquid levels in their containers without having to open the container. Options include polypropylene and stainless steel construction, clear and frosted acrylic lens options, gauges with or without valves, and gauges designed for specific liquid types like chemicals or petroleum. Gauges feature direct mount or flange mount installation. Lengths range from 7" to 48". These gauges are useful for monitoring liquid levels in industrial drums and tanks.