The HYDRION Lab USA pH Test Paper Tape Strips are a reliable and versatile product for testing pH levels. Made by HYDRION under the Micro Essential Laboratory brand, the 15ft roll of paper tape strips offers a wide range of pH values from 0-13. Manufactured in the United States, these Insta-Check 93 Tape strips are ideal for lab and school testing purposes. The bundle listing includes a variety of test strips, providing users with an essential tool for measuring pH levels accurately and efficiently. Additionally, the product comes with a warning regarding the potential health risks associated with the Phenolphthalein contained within.