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Shake the bottle before use. Always pour a small amount into another container to test pH, and do not place your pH probe directly into the bottle. This will avoid contamination of the Buffer 4 in the bottle and will maintain its accuracy.
This set is a cracking and most essential piece of keeping your meters working properly. Way to many people forget that part and only wish they had treated them tidy when their plants bite them back by turning tots up and flowers down on them.
Having just got back into hydroponics after many years, I find that this pack does everything I require. it has helped me to re calibrate a neglected PH meter saving more than the pack cost!