Reddit reviews Size 675 hearing aid battery ZA675 A675 pr44 count 6pcs/card
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I use these in mine- https://www.amazon.com/gp/product/B01N4IVKRG/ref=oh_aui_search_asin_title?ie=UTF8&psc=1
Alternatively, you can use it without batteries if you don't need the meter. Make sure you cover the light sensor above the lens though, as it draws power when it senses light.