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Premium quality pH solutions from Hanna Instruments for calibrating your pH meter. Hanna’s line of calibration buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle.
Usually available for these pH levels: pH 4.01, pH 7.01
Reported values are accurate to +/- 0.01 pH at 25°C.
From: Hanna Instruments