It's always a good idea to check the pH of your soap, but unfortunately many of the paper pH strips on the market are inaccurate for measuring surfactants such as soap. That's not the case with these laboratory-grade pH strips which have been tested for accuracy with soap. Manufactured by Macherey-Nagel of Germany, these pH strips measure the 7.0 - 14.0 pH range, in .5 pH units. Each plastic strip has 3 bands of pH indicators, providing clear color changes for easy comparison to the accompanying color scale. 100 strips per box.

pH Strips - $16.00 per box (plus shipping)