Designed specifically for the Alpine PRO Cold Tub , this calibration kit helps ensure accurate pH and ORP sensor calibration for reliable automated water care performance. The calibration kit includes three 20 mL single-use packs of premium quality pH 4.01 buffer solution, three 20 mL single-use packs of pH 7.01 buffer solution and three single-use packs of 470 mV ORP (Oxidation-Reduction Potential) test solution. The kit includes: Three 20 mL single-use packets of premium pH 4.01 buffer solution Three 20 mL single-use packets of premium pH 7.01 buffer solution Three 20 mL single-use packets of 470 mV ORP (Oxidation-Reduction Potential) solution Each foil packet is individually sealed to preserve freshness and is clearly marked with its lot number and expiration date. The premium buffer solutions have a shelf life of up to five years when unopened. Features Designed for Alpine PRO calibration Individually sealed, color-coded packets for easy identification pH accuracy of ±0.01 at 25°C (77°F) Temperature chart and calibration instructions printed on each packet Long-lasting, premium-quality calibration solutions