Heat sensitive, colour change blue to pink with moisture. Depending upon humidity, papers may be pink on receipt and will need drying before use. Box of 10 books.

Colour change to red or neutral. 10 books each with 20 strips.

Range pH 8-5, colour change. 10 books each with 20 strips.

Range pH 8-5, colour change. 10 books each with 20 strips.

This test paper covers the range pH1 to 14. Box of 10 books each of 20 leaves, 65 x 10mm. 12 colour matches are printed on each book cover.

Range pH 1 to 14 in clear colour coded steps.

Colour chart is on the side of the plastic dispenser.

5m of 6mm paper.

Range pH 1 to 11 in clear colour coded steps. Colour chart is on the side of the plastic dispenser. Box of 10 books with twenty strips. 5m of 6mm paper.