Calibration agent set for digital pH meter 2 sets [SL] (Silhouette) (pH6.86, pH4.01 @25℃)

Calibration agent set for pH meter (pH 6.86, pH 4.01) 2 sets (2 bags each) Pour into 250ml of distilled water. Dissolve any remaining powder in the bag. Standard temperature: 25℃ Due to shipping costs, we are selling in sets of 2. [Applications] Digital pH meter calibration agent set (2 sets) pH 6.86, pH 4.01 @25℃ 2 bags each [Materials] - pH 6.86 Neutral mixed phosphate - pH 4.01 Phthalate Pure water for calibration - If distilled water is not available, please use commercially available purified water. Dissolve any remaining powder in the bag. We do not handle saturated potassium chloride solution (KCl 3.3mol/L) for electrode storage. *Please be careful that children do not accidentally drink the proofing agent. If it gets in your eyes...Rinse thoroughly with running water. If swallowed... If a large amount is swallowed, drink plenty of water and induce vomiting. Get medical treatment if necessary. Correction - pH 4.01 Calibration Agent The temperature correction table on the back says pH 4.00 at 25℃, but this is an error of pH 4.01.