Fred’s Head from APH, a Blindness Blog

Fred’s Head, offered by the American Printing House for the Blind, contains tips, techniques, tutorials, in-depth articles, and resources for and by blind or visually impaired people. Our blog is named after the legendary Fred Gissoni, renowned for answering a seemingly infinite variety of questions on every aspect of blindness.

(See the end of this page for subscribing via email, RSS, browsing articles by subject, blog archive, APH resources, writing for Fred's Head, and disclaimers.)


Monday, June 28, 2010

Visually Impaired People Can Count Drops

Easy-to-use acoustic sensor for droppers helps visually impaired people to count drops of any liquid, with any dropper.

The acoustic sensor for droppers has a rectangular shape. The sensor area is on the top surface and is marked by a rectangular groove mark, for easy tactile perception. On the bottom surface there is the room for a 9V battery and the product plastic label. The headphone output jack is placed on one side.

Put the headphone in your ear and connect the cable to the device, plugging it in the output jack on the side of the device, which will then switch-on automatically.

Put the device on a table or a flat surface, with the sensor area up. Put a plastic glass on the sensor area, within the rectangular groove mark. No precision is required, but ensure that the bottom of the glass is placed within the mark. Keeping the glass steady with one hand, start dropping the liquid into the glass with the other hand. Anytime a drop falls into the glass, its vibration is amplified by the device and you will hear it through the headphone. The device helps you count drops of any liquid!

For more information, contact:

dr. Raul Pietrobon
V. G. Carducci 35/B
28062 Cameri (NO)
Phone: 0321 51 80 18
Fax: 0321 18 50 900

No comments:

Subscribe to receive posts via email

* indicates required

Browse Articles by Subject

Follow us on Twitter


Write for us

Your input and support in the evolution of Fred's Head are invaluable! Contact us about contributing original writing or for suggestions for updating existing articles. Email us at


The American Printing House for the Blind (APH) makes every attempt to ensure the accuracy and reliability of the data contained in the Fred's Head articles; however, APH makes no warranty, guarantee, or promise, expressed or implied, concerning the content or accuracy of the information provided in Fred's Head. APH does not endorse any technique, product, device, service, organization, or other information presented in Fred's Head, other than products and services directly offered by APH.

The products produced by the American Printing House for the Blind are instructional/teaching materials and are intended to be used by trained professionals, parents, and other adults with children who are blind and visually impaired. These materials are not intended as toys for use by children in unstructured play or in an unsupervised environment.

The information and techniques contained in Fred's Head are provided without legal consideration (free-of-charge) and are not warranted by APH to be safe or effective. All users of this service assume the risk of any injury or damage that may result from the use of the information provided.

Information in Fred's Head is not intended as a substitute for professional advice or treatment. Consult your physician before utilizing information regarding your health that may be presented on this site. Consult other professionals as appropriate for legal, financial, and related advice.

Fred's Head articles may contain links to other websites. APH is not responsible for the content of these sites.

Fred's Head articles created by APH staff are (C) copyright American Printing House for the Blind, Inc. You must request permission from APH to reprint these articles. Email to request permission.

Any submissions to Fred's Head should be free of copyright restrictions and should be the intellectual property of the submitter. By submitting information to Fred's Head, you are granting APH permission to publish this information.

Fair Use Notice: This website may contain copyrighted material whose use has not been specifically authorized by the copyright holder(s). This site is operated on the assumption that using this information constitutes 'fair use' of said copyrighted material as provided for in Section 107 of U.S. Copyright Law.

Opinions appearing in Fred's Head records are solely those of the contributor and do not necessarily reflect the views of the American Printing House for the Blind.