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EASY TO USE - Simply drop one tablet in 20 mL of distilled water and wait 90 seconds. TONS OF TABLETS - This listing provides 30 tablets total, 10 tablets at each pH value. BETTER THAN POWDER - These tablets have a 3 year shelf life! Tablets are tidy and more precise compared to messy powders. COLOR CODED - Each pH buffer produces a different color liquid ensuring you always know which pH solution is which. HIGHLY VERSATILE -Test tablets allow for you to create fresh calibration solutions at any time! Tablets remain the most consistent and reliable reagent format available, delivering maximum accuracy for the user.