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  1. S

    CO2 drop checkers & bromothymol blue

    thanks I have the API master test kit which includes High Range (no good) and a.n.other covers PH 6.0 to 7.6 is this other the one that is likely to be ok - as far as i can see API don't do a PH test call 'low PH' many thanks for you help!! :D
  2. S

    CO2 drop checkers & bromothymol blue

    Can anyone tell me if API PH Test Kits contain bromothymol blue that would work with 4dKH solution in a drop checker thanks Paul
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