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Ensure accurate pH measurements in your water analysis routine with the ASTRAL pH 4 Buffer Solution. Specially formulated for cleaning and calibrating electrodes, this ready-to-use solution guarantees precision and stability for all standard pH meters used in pools, spas, and laboratory testing.
The pH 4 Buffer Solution is a stable aqueous solution with a certified pH value of 4.00 at 20°C. Used as a reference point in pH calibration, it ensures your electrode systems remain reliable and precise over time. It is one of three buffer values offered by ASTRAL to cover the full calibration spectrum: pH 4 (acidic), pH 7 (neutral), and pH 9 (alkaline).
This solution is essential for maintaining accurate and consistent pH measurements in water treatment and analysis equipment. Regular calibration with pH 4 buffer prevents drift and extends the life of your electrodes by ensuring reliable data collection.
This pH buffer is an essential tool for any water analysis system where accuracy matters. Whether you're maintaining a pool, operating a water treatment facility, or managing lab equipment, this solution offers a consistent, affordable, and trustworthy way to verify your readings.
Manufactured according to laboratory-grade quality control. Conforms to typical standards for electrochemical measurement solutions. No safety data sheet required under current EU regulations for non-hazardous liquids.
Not sure if this solution is compatible with your meter? Please email us at or include your equipment details when ordering. We’ll contact you before shipping if there’s any uncertainty.
Data sheet
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