5x Harris Bier pH Teststreifen Packung mit 50 Streifen Farbbereiche sind 4,6 bis 6,2
The colour ranges are 4.6, 5.0, 5.4, 5.8 and 6.2. To increase acidity you will need to add an acid to the mash. Lactic Acid is the preferred way as it mixes well with the beer flavours. It is available in either liquid or powder.