If you are looking for some professional and portable PH papers, then your research is here. That's because our products can meet your demands. Made of and craftsmanship, very practical, can offer you convenience and suitable for many purposes. Features -Color:Multi -Material:Paper -Size:7.00X5.00X0.30cm/2.75X1.97X0.12in - Made of premium paper material, these PH are convenient for storage and outdoor carrying. - The PH can be compared with interval, easy to use. - The PH can identify the acidity and alkalinity of from the color change. - Suitable for testing water, juice, milk, liquid , moisturized soil, saliva, , etc - Also can be used in school teaching, labs experiment, and outdoor, home, better fit your demands. Package list: 3 Packs x Papers(5.5-9.0ph) 3 Packs x Papers(0.5-5.0ph) 3 Packs x Papers(3.8-5.4ph)