Semi-Quantitative Ion Test Paper from Iron 1000 Peroxide 1000

Semi-quantitative testing is possible using test paper with color reagents that specifically react to ions in the sample liquid. Measuring is performed by immersing the test paper into solution and then determining the degree of change in color by comparing it to the color scale on the outer casing. Color comparison is extremely clear-cut, as the test paper pasted on the end of the plastic stick (excellent ion selectivity, 0.2 mm thick) is the same size as the color scale, and minuscule sample amounts can be used.