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A-A-51309 1985 Edition, December 20, 1985
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COMPARATOR, COLOR (CHLORINE AND PH DETERMINATION)
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The General Services Administration has authorized the use of this commercial item description.

This commercial item description covers a color comparator set suitable for use in performing pH, free residual chlorine, monochloramine, dichloramine, and total residual chlorine determinations of water in the field.