Your Low Vision Store - Magnifying Aids! 2 Stage EZ Fill Liquid Level Indicator Reduce your chance of overflowing your coffee or tea mug with this 2 stage liquid level detector. It features 2 prongs with adjustable depths warning you with a beep or buzz as your drink reaches the lip of your mug. The 2 stage liquid level alert will emit a high pitched beep and or buzz as the liquid rises to the top of your cup. This is a great tool for those who can not see well or are Blind when they are pouring hot and cold drinks. Simply hang it on the lip of your drinking vessel and it is ready to be filled. Uses two button cell batteries which are included. The prongs are made of food grade stainless steel and the maximum depth of the prongs are 1.3" and the minimum is .75". Item:756017