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High accuracy (±0.01 pH): standardized against NIST Certified pH references within 0.01 pH at 25˚c (77˚f). ideal for the calibration of all kinds of pH meters Color-coded, double-sealed, 1-Year shelf life. Expiration Date and temperature/pH reference chart provided for reference Apera's unique cal box included, No more mess for your meter's calibration The 3M KCL storage solution helps keep the sensitivity and accuracy of your pH probes Non-hazardous product (MSDS is downloadable)