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Hanna* Checker* pH Tester
A modern substitute for litmus paper with a replaceable electrode. Checker features a large LCD, 0.00 to 14.00 pH range, 0.01 resolution and fast and accurate manual two-point calibration. It is compatible with most pH electrodes, weighs just 2.5 oz and operates 3000 hours on two 1.4V batteries (included). Operates in temperatures from 0° to 50°C.