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Utilizing the characteristics of free flow or self-leveling of water, the flow of water in the level drives the air bubbles to move to judge the level of the plane. When one side of the plane is higher and the other is lower, due to the characteristic of water flowing to the lower side, the water will flow to the lower end, resulting in more water at the lower end, driving the bubbles to deviate and go to the higher side.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.