1000mm High precision Liquid Level Ruler for measuring

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