The Krueger 16N559 is a liquid level gauge designed for use with hydraulic reservoirs and gear boxes. It features a polycarbonate lens for impact and chemical resistance. The gauge has a dual scale that measures in inches and centimeters with a 6 inch range. It has a 1/2 inch NPT bottom connection and is made from steel with a powder coat finish for durability. The gauge allows the user to visually monitor fluid levels. With its durable construction, dual scale measurements, and chemical resistant lens, this gauge is well-suited for monitoring fluid levels in industrial hydraulic and lubrication systems.