High Accuracy Liquid Level Ruler Measuring for Lqiuid Nitrogen Dewar Tank

Liquid level ruler for measuring liquid nitrogen manually. This liquid level meter can provide an easy measurement for a liquid nitrogen tank or cryogenic freezer. Place the ruler to the bottom of the container, hold for a while untill you 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.