I take this for health purposes to determine approximately urine pH, and out of curiosity :) I have tested this piece of paper with shampoo, shower gel, yogurt, etc., and they are doing their job. The colors for 1-2 and 12-13-14 are virtually indistinguishable, but at these levels it would not matter to me whether 1 or 2, and with such dangerous means I would have most likely other concerns. A packet is approximately 4.5x6.5 cm tall and has 4 blocks with a 40 leaflets.
For professional use, they would probably not suitable, but for smaller claims extends this completely.
