This pH test paper book with a measuring range of 3.8-5.4 is specially customized for weak acid liquid testing, ideal for skincare, fruit juice, wine, cosmetics and plant extracts. Each booklet stores neatly stacked test strips to block moisture and prevent reagent failure during storage. Made of premium absorbent filter paper coated with stable acid-sensitive indicator, the strips create clear, distinguishable color gradients after quick immersion. Match the strip tone to the printed color scale on the booklet to get precise weak-acid pH data in seconds.

It requires no batteries or complex testing equipment, lightweight and portable for laboratory, beauty salon and home daily detection. Perfect for testing facial toner, fruit vinegar, plant nutrient solutions and fermented beverages. Compared with full-range pH strips, this narrow-range paper offers higher test accuracy for slightly acidic samples. Compact pocket size saves storage space and avoids strip waste. Every batch passes strict quality control to ensure consistent color reaction, helping beauty workers, brewers and lab staff accurately monitor weak acid liquid pH values efficiently.