With the pH 4.01 calibration solution from  Water Master you can keep your electronic pH meter and multiparameter meters calibrated in a 4.01 pH solution.

You should always take into account the EC and pH level that we will apply to our plants in any type of crop, and an incorrect level in one of these could cause a nutritional imbalance in the plants, affecting their health and development. If you want to get exact measurements, you should calibrate the pH meters periodically. Check the water temperature carefully and...

With the pH 7.01 calibration solution from  Water Master you will achieve the correct pH measurement values. How to use Water Master pH 7.01 calibration solution: - Immerse the electrode in the calibration solution at room temperature...