EZ Fill Liquid Level Indicator
EZ FILL is an inexpensive, lightweight device that makes it easier and safer than other products tested, to assist a visually impaired or Blind person in adding hot or cold liquid to any size cup or container. Two prongs that hang on the inside of your container will buzzes when liquid is 1 inch from the lip of your container.
- Measures: 2 1/2 X 1 1/4 Inches
More information: https://www.magnifyingaids.com/EZ-Fill-Liquid-Level-Indicator