Hanna Instruments pH 4.01 and 7.01 Calibration Buffer Sachets 2 x 20mL (HI77400P)

HI77400P pH 4.01 and 7.01 Calibration Buffer Sachets (2 x 20 mL) by Hanna Instruments is a high-accuracy calibration set designed to ensure proper performance of pH meters and testers. This product includes one sachet of pH 4.01 buffer solution and one sachet of pH 7.01 buffer solution, each containing 20 mL of ready-to-use liquid. It is the ideal solution for those needing a small, single-use calibration set without committing to a full box of sachets.

These buffer solutions are essential for accurate pH calibration, especially when performing a two-point calibration. The pH 7.01 buffer serves as a neutral point, while pH 4.01 allows calibration at the acidic end of the scale. This combination is widely used in applications such as food and beverage testing, water treatment, laboratory work, hydroponics, and more—where precision and stability in pH measurements are critical.

Each sachet is individually packaged to maintain freshness and prevent contamination. The solutions are produced according to ISO standards using high-purity ingredients and deionized water, and they are traceable to NIST Standard Reference Materials. They offer a pH accuracy of ±0.01 at 25°C, ensuring confidence in every calibration.

To use the HI77400P sachets, simply open one packet, pour the contents into a clean container or calibration cup, and immerse the pH electrode in the solution. Follow your pH meter’s calibration steps, and be sure to rinse the electrode with distilled water between each buffer to avoid cross-contamination.

This compact calibration set is perfect for occasional users, field testing, or anyone looking to avoid waste while still achieving precise results. By purchasing one sachet of each value, you maintain full calibration functionality without overspending or storing excess product.

With Hanna Instruments HI77400P, you get laboratory-grade quality in a convenient, single-use format—ideal for maintaining the accuracy of your pH equipment wherever precise measurement is required.