The Grainger Approved Therma Level Gauge HDPE D-57in is a 57 inch long dipstick designed for measuring liquid levels in tanks and reservoirs. It is made from durable high density polyethylene plastic and has easy-to-read level markings every 1/4 inch. This dipstick has a D-shaped cross section that prevents rolling and provides a consistent flat side for accurate readings. It can withstand temperatures up to 200°F and is suitable for use with water, diesel fuel, solvents, antifreeze, oil and more. This is an economical liquid level gauge for basic level monitoring in non-critical applications.