Level Fillers are for Artisans who wish to fill their bottles to the height they choose, regardless of bottle variations. The Level Fillers are designed with the sensor control which shuts off the fill at the desired height. Simply set the fill level you want for your bottle by adjusting the shelf to the desired height, then place your bottle on the shelf. When the bottle is placed on the shelf, it will trigger the snap switch, which starts the fill. The fill will be shut off when the sensor detects the liquid hitting the correct level in the bottle.