1500mm High precision Liquid Level Ruler for measuring

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