Feature:1. FAST AND ACCURATE: 6.98.4 PH test strips quickly and accurately measure the acidity and alkalinity of liquids. The measurement range is 6.98.4.2. 1600 STRIPS: Lightweight PH test strips are lightweight and portable, perfect for field work. A total of 1600 ph test strips, a sufficient number of strips.3. APPLICABLE: PH test strips can test your body's pH level daily and monitor the pH of drinking water, food, etc. to help you meet your dietary goals.4. EASY TO READ: Water quality testing strips are made from premium filter paper and are extremely accurate and reliable. Easy to use and easy to read.5. NOTE: To ensure the accuracy of these test strips, store these pH test strips in their original packaging in a cool, dry place away from sunlight.Specification:Item Type: PH Test StripsMaterial: PaperProduct Size: Approx. 6.2x1x0.1cm / 2.44x0.39x0.04inSingle Book Contains 80 Ph Test PaperUse: Widely Used In Industrial Chemical Testing, Science Education, Laboratory Use.Package List:20 x Test Paper BookNote:Manual measurement there is 0.10.2cm error