For the times when you want to make sure that your soap formula worked correctly, these pH strips are perfect. Many of the paper pH strips on the market are not accurate for testing surfactants like soap. These laboratory-grade strips 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.
1 Box (100 Strips) $16.00