Unisol indicator solution 410, pH 4-10, 1 unit(s)Unisol indicator solution 410, pH 4 10, Incl. 100 ml dropper bottle containg reagent, colour chart, 1 type 13 72 measuring cuvette, Density (D) 0,79 g cm, Flash point (flp) 12 C, Boiling point (bp) 78 C, UN Nr. 3316 For pH measurement in weak buffered solutions, in pure water, in surface water and in highly diluted acids or alkalis. Droplets of an indicator solution are added to the sample and the reaction colour is compared to a colour chart.