This item is well made of premium material for safe and practical use.This pH value test strips are designed specifically for measuring the pH level in liquid.Extra wide measuring range from 1 to 14 and lightweight detection in 4 colours provide good results. The colour chart on the packaging for easy reading. Feature - Color: As shown. - Material: Paper. - Size: About. 7x4.5x0.2cm -Perfectly suited for determining the pH value in the pool before or after the use of pH value Senkers. -Ideal for pH values of different liquids. -Also possible for measuring the pH value in vaginal tightening pleasure during pregnancy. - High accuracy pH test paper, pH range from 1-14 - Simply press the testing strip to the object or liquid you are testing. Half second later, take out the paper and using the color chart included, compare the color change of the paper to find out the acidity level of your testing subject.