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