Meritline.com offers this Battery Tester for $3.25. Apply coupon code "MLCK412066061840NL1" to drop it to $1.49. With free shipping, that's tied with last week's mention as the lowest total price we've seen for such a device. It works with AA, AAA, C, D, 9-volt, and button-cell batteries. Deal ends after 1,000 coupon redemptions.
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