Universal pH Litmus Paper Roll 0 - 14 (5 meter)

5 out of 5 stars Monday 22 May, 2017 By M Martindale
I use these to introduce primary school children to the wonders of science. Tap water, saliva, baking soda and vinegar are tested by the children to determine pH of various solutions. The accompanying colour chart worke perfectly and often confirm the expected results.
Children and demonstrator are always suitably impressed.
Small package delivered very promptly through letter box.