... forms of NH4 and NH3. NH3 is toxic,but NH4 is non-toxic and can be absorbed by ... is above 7.5,NH3/NH4 test become a very important work.NH3/NH4 test kitContents:1x2g test reagent, 1x22ml test reagent, 1x22ml test reagent,1x22ml test ... reagent,Test vial Color scale Instructions & Recommendations NH3/NH4 test kit