UNISOL are indicator solutions that are directly applied to the sample. The resulting colour of the sample is compared to a colour chart that is included in the kit. UNISOL indicator solutions are especially suitable for pH measurement in non-buffered samples like pure water or surface water. In these samples, other indicator papers find their limit of applicability. UNISOL comes in units of 100 ml in drop bottle, with colour scale and 1 plastic cuvette MN 13/72