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APERA INSTRUMENTS AI209-T Value Series PH20 pH Tester Combo Kit, including the Maintenance Set, and a CalPod Solution Holder for Easy Calibration: Amazon.com: Industrial & Scientific
Amazon.com: aaa rechargeable batteries
Amazon.com: KENDAL Ultra Power Alkaline 1.5v MN9100 LR1 N Size Batteries 4 Count : Health & Household