[QUOTE=John King;116187]Thanks for that I will check tomorrow when I go into town.
Removing a sticker to expose air holes, sounds very much as if they work on the same principal as the Wein cells that cost a damn sight more...../QUOTE]
The cynic in me thinks that they might be the same thing. Why the price difference? Marketing! The hearing aid customers need a good supply and couldn't afford photographers' prices. There is profit in all of the transactions of course.
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