Achieve accurate and reliable pH measurements with this convenient 3-pack of color-coded buffer solutions. Designed for quick and easy electrode calibration, each kit includes 500 mL bottles of pH 4.01, 7.00, and 10.01 standards with an accuracy of ±0.02 pH units. Cost savings compared to purchasing individual bottles while ensuring precision across the full pH range. Ideal for use in labs, aquaculture, water treatment, food and beverage, and a wide variety of testing applications.