Good Water (PrecipSol4-32) #4 - 32 OZGood Water Warehouse Good Water PrecipSol4 32 pH Test Kit Accurate pH measurement for dilute, unbuffered water samples where standard test kits fail 32 oz Bottle Model #4 Low Buffer Capacity WHY IT WORKS Engineered for dilute solutions with less than 0. 1% phosphate buffer Precision in Dilute Solutions Formulated specifically for water with low buffer capacity where standard pH tests give inconsistent results Fresh Water Versatility Works across tap