Buffer solution for calibration pH 4.01 20 ml - 7031423

Buffer solution for calibration pH 4.01 20 ml

This ready-to-use 20 ml pH 4.01 buffer solution is the acid-end reference point used when performing a two- or three-point calibration of any pool or spa pH electrode or dosing controller. A precisely formulated pH 4.01 value at 25 °C gives the probe a reliable low-end anchor, ensuring your automated chlorination system doses correctly and your water chemistry readings can be trusted.

Role in pH electrode calibration

pH probes drift over time and must be calibrated regularly against a known reference. The pH 4.01 buffer is the standard acidic reference point used alongside a pH 7.00 or pH 7.01 mid-point solution to perform a two-point calibration — the minimum recommended routine for pool dosing controllers and inline sensors. Calibrating against a certified buffer removes accumulated measurement error and extends the working life of the electrode.

Single-use convenience

At 20 ml, this vial provides exactly the right quantity for a single calibration session — enough to rinse the electrode and immerse the tip fully without wastage. Single-use portions eliminate the risk of contaminating a larger stock bottle between calibration intervals, keeping each session’s reference value uncompromised.

Compatibility & calibration frequency

The solution is compatible with the pH probes and controllers sold across the automated chlorination range, including redox/pH combination sensors used with salt chlorinators and liquid-dosing units. For pool and spa applications, calibration at least once a month — or whenever readings appear suspect — is recommended to maintain accurate water balance and safe chlorine dosing.