Taylor Phenol Red Reagent Ph Indicator for Midget & Slide Comparators, 2 oz, 12/Pack | R-1003J-C-12
$7.42
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Taylor formulates its reagents to remain effective for at least one year, with only very few exceptions (molybdenum indicator in liquid form is one; after four months old it should be tested against a standard periodically). As a general precaution, replace all reagents more than one year old, or at the beginning of a new testing season.
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