The Hearing Aid Museum

Hearing Aids of all types—Ear Trumpets, Carbon Hearing Aids, Vacuum Tube Hearing Aids, Transistor Hearing Aids, Body Hearing Aids, Eyeglass Hearing Aids and much more!

FREESubscriptionto:
Hearing Loss Help
The premier e-zine for people with hearing loss

Your email address
will never be
rented, traded or sold!

Your First Name:

Your E-mail:

General Info

Non-Electric

Carbon

Vacuum Tube

Transistor (Body)

Transistor (Ear)

Cochlear Implants

Miscellaneous

For Sale

Search this site:

Results per
page

all words

any words

Click on the "General Information" button (top button above) for an overview and general information on this category of hearing aid.

Hearing Aid Battery Testers

Graybar Battery Tester

The Graybar 0 - 6 volt battery tester was manufactured by the Graybar Electric Corporation of Kearney, NJ somewhere around 1925 to 1935 to test the voltage of the batteries used by Western Electric carbon hearing aids of that era.

The name Graybar was derived from the names of the two founders of Western Electric, Elisha GRAY and Enos BARton.

Click picture for larger view

This Graybar battery tester had an adjustable pin (right), shown in its narrowest position.

Click picture for larger view

View of the Graybar Battery Tester with the adjustable pin (right) shown in its widest position for testing batteries that had their terminals further apart.

Click picture for larger view

(If a larger picture doesn't appear, you may have to turn your pop-up blocker off)