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Bluelab pH 4 calibration solutions are essential if you are using bluelab water meters and testing equipment. They are specially formulated for Bluelab probes and testers and are manufactured using high laboratory standards to ensure your water testing equipment function with perfect accuracy and last longer.
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Everything was seamless, fast delivery, communication was great, definitely would buy from you again.
have not used the item as the ph pen arrived with sufficient sachels of ph4 & ph7 calibration solution what would like to state is the service and fast delivery is excellent