Replacement NH4 & NO3 color cards for the urea testing.
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Urea Color Cards
These cards are used to visually identify the results of the ammonium and nitrate test solutions as they may appear within the spot plate. Set of 2 cards (NH4 & NO3) for RBTI Urea Tests.
These are replacement cards and are identical to those that are included in the UpH-3 kit.