Floater Indicator for the Blind


I am writing to ask if it is possible to be able to manufacture a floating device to indicate how much liquid - including hot water - is being poured in a glass or cup.

"The Floater" Should be about 3 - 4 centimeters across or possible size between a loony and a toonie coin. It should be able to float in a hot liquid and be removable from liquid by a blind person.

Purpose: So a visually impaired or blind person can tell the amount of fluid in the container.

This information and finished product is to go to the Canadian National Institute for the Blind, Halifax Division.