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250ml bottle of Bluelab PH 7 calibrating solution, to calibrate your digital PH meter. It is recommended to pour a little of the calibration liquid into a separate glass in order not to contaminate the bottle with the probe. Keep tightly closed in a dark place. Bluelab quality
250ml bottle of Bluelab PH 4 calibrating solution, to calibrate your digital PH meter. It is recommended to pour a little of the calibration liquid into a separate glass in order not to contaminate the bottle with the probe. Keep tightly closed in a dark place. Bluelab quality
Sobre de 20 ml, para un solo uso.