Milwaukee pH Tester Calibration/Buffer 4.01 Solution - Lot of 3
$6.95
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Use with Milwaukee pH Meters and Controllers. These calibration fluids should be used whenever replacing electrodes, if you get an abnormal reading, or at least every month for general maintenance. This 4.0 pH solution is ideal when combined with 7.0 solution for 2-point calibration for most freshwater or low-pH aquarium systems.
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$6.95
(+$5)