Apera Instruments pH/EC Calibration Solution Kit (pH 7.00, 4.01, 1413 µS, 12.88 mS) plus 3M KCl Storage Solution, 250 ml each & CalBox

The Apera Instruments pH/EC calibration buffer solution set contains two bottles of pH buffer solutions (pH 4.00 and pH 7.00) and two bottles of conductivity (EC) standard calibration solutions (1413 μS/cm and 12.88 mS/cm) as well as a bottle of 3M KCl storage solution (each of 250 ml) for pH/ORP-electrodes, plus an Apera CalBox that helps to organise all solutions in one place and simplify the entire calibration process. All buffer solutions are standardised against NIST certified references at 25°C (77°F). It is ideal for calibrating all pH and conductivity meters. Since the pH and conductivity value are affected by the temperature, the temperature and pH / conductivity reference tables on the bottle labels are given as a reference. The 3M KCL storage solution helps maintain the sensitivity and accuracy of your pH probes All solutions have a shelf life of up to 2 years (up to 1 year for conductivity solutions). With proper storage, the pH solution can be used 10-15 times before replacement (conductivity solution up to 5 times). Never pour the used solution back into the original bottle to avoid contamination. The expiry date is printed on the bottle. A batch certificate can be downloaded. Note: store at room temperature and away from direct sunlight. Keep the bottle tightly closed when not in use. Keep out of reach of children.