The magnetic flap level gauge (also known as the magnetic float level gauge) was developed based on the buoyancy principle and magnetic coupling. When the liquid level in the tested container rises and falls, the magnetic float in the body tube of the liquid level gauge also rises and falls. The permanent magnet in the float passes through the magnetic coupling to the magnetic column indicator, and the red and white columns are driven to flip 180 °, when the liquid level rises, the column turns from white to red. When the liquid level drops, the column turns from red to white. The red-white junction of the indicator is the actual height of the liquid level in the container, thus achieving a clear liquid level. Instructions. The distance between two adjacent indicator plates in the axial direction is 10mm, therefore, the liquid level indication error is ±10mm. Automatic Paper Lunch Box Machine hangzhou mankun imp. exp. co., ltd. , https://www.multihzmachine.com