10 books of pH paper used in dyeing to measure alkalinity or acidity, supplied in a perspex box. This is Universal pH paper (pH 1 to pH 11) supplied as books of 20 strips; each strip is 1 cm wide by 6.5 cm long and is used once only. Each book has a colour comparison pH chart. SAVE £2.00 over the price of the individual pH paper books.
The pH paper box is packed in a polythene bag, placed in a small padded envelope and posted to you First Class.