1000mm High quality Liquid Level Ruler for measuring

Danclan Liquid level ruler for measuring liquid nitrogen manually. This 1000mm high quality liquid level meter can provide an easy and efficient measurement for a LN2 tank or cryogenic container. Place the ruler to the bottom of the container, hold for a while untill see a frost line. There are two models for the ruler, 1500mm and 1000mm, and the logo on the ruler can be customized by demand.