The Grainger website features liquid level gauges for drums and tanks. These gauges are made of galvanized steel or HDPE and use a rod or float mechanism to indicate liquid level. They are designed for use in 55-gallon drums and larger tanks up to 96" diameter. Key features include corrosion resistance, chemical compatibility, accuracy within 1/4", and visibility in daylight. The gauges mount to the top of the tank and require a 1" NPT opening. They are available in lengths from 36" to 96" to accommodate different tank heights. The HDPE models can withstand temperatures up to 200°F. The gauges provide a simple, reliable way to monitor liquid levels.