Description<br> Even though, portable PH meters are easy to use, they require calibration at time to time. And this mega value 3-pack calibration kit is time and money saving. These buffer solution powders come in pre-measured packets: Just mix each packet with 250 mL of distilled water, and your calibration solution is ready. Before purchasing, make sure that your meter uses listed solutions for calibration.<br> Feature<br> - Color: As Shown.<br> - Material: Powder.<br> - Size: 5 x 5 x 0.5 cm.<br> - Included one package of 4.01, one of 6.86 and one of 9.18 calibration solution for all pH needs<br> - Fast and easy. No need to measure, just mix individual packs with distilled water.<br> - Accuracy. Calibration powders enable you to test the pH of your pool, aquarium, water, and more quickly with your pH tester / meter.<br> - Long Term Use. Save time and money by mixing powders in a jar of distilled water. This lets you keep them longer and more readily available without needing more packets.Package list: 1 x PH Calibration Solvent Powder(PH 4.01)<br> 1 x PH Calibration Solvent Powder(PH 6.86)<br> 1 x PH Calibration Solvent Powder(PH 9.18)<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store