Calibration set pH4.00 + pH6.86 + pH9.18 (3pcs)

pH calibration solutions - set of 3 pcs, pH values 4.00 + pH 6.86 + pH 9.18, acidic coverage, neutral and alkaline ranges for accurate three-point calibration of pH meters, certified reference values, suitable for laboratory and field pH meters and electrodes, ensure metrologically correct measurements over the entire range