There are 2 products.
pH pencils are used for testing the Acid Alkaline levels on uneven surfaces. Each mechanical pencil will give the user at least 100 tests. Comes with colour chart and instructions.In Stock
pH Pencils will test surface pH Acid and Alkalinity. Each box comes complete with 3 x Pencils & 3 x Colour Charts with Instructions.Each pencil will give the user at least 100 tests.In Stock