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Amazon product: Dlyfull Universal Battery Tester with LCD Display, Multi Purpose Small Battery Checker for AA AAA C D 9V CR2032 CR123A CR2 CRV3 2CR5 CRP2 1.5V/3V Button Cell Batteries (Black)
Customer Reviews:
Great little battery tester! I work with a lot of photo and video gear and have tons of different batteries for all the little gadgets needed. Now I can feel that much more prepared heading out to a gig after testing which batteries need recharging and changing. There’s only one type of battery I wish was added to this device (18650), but otherwise all the other slots are very useful. Easy to read display with many levels of charge (instead of only 4 bars etc). It even comes with a AAA battery to get you started. I would definitely recommend this product.