Safe material: BPA free and free from any other harmful and toxic chemicals. Calibration powders enable you to test the pH of your pool, aquarium, water, and more quickly with your pH tester / meter. These buffers are accurate to within ±0.01pH units 25°C and remain stable over long periods of time. Easy operation: Fast and accurate results. No need to measure, just mix individual packs with 250ml distilled water. Designed for portability: Individual sized packets can be tucked in drawer, bag or suitcase for travel. Total 20 packs-The set includes 10 package of 4.01, 10 package of 6.86 calibration solution powder for all pH needs. Specifications Each Pack Volume: 250 ml. Each powder packet/sachet makes 250ml of solution (when mixed with distilled or deionized water). Accuracy: ±0.01pH at 25°C. Color: show as pictures. Size: 7.5x6.5cm. 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. Package Included 10 * pH4.01 Calibration Powder. 10 * pH6.86 Calibration Powder.
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