📊 Measure with Confidence—Stay Ahead of the Curve! Always have a backup on hand for continuous testing. Easily fits in your lab coat or pocket for on-the-go testing. No technical training required—just grab a pencil and start measuring! Accurate pH readings from 0 to 13 for all your testing needs. Ideal for detecting acid or alkali residues in various environments. pH range 0-13 detects acid/alkali easy-to-use pencils The Micro Essential Lab P-12M Hydrion Insta-Chek Surface pH Pencils offer a straightforward solution for measuring pH levels from 0 to 13. This pack of three user-friendly pencils requires no technical training, making it perfect for professionals who need quick and reliable results in detecting acid or alkali residues.