Certified Reference Material for compliance-controlled laboratories and facilities
Available in multiple volumes to reduce waste and support various levels of lab throughput
Color-coded and/or clearly labeled for easy identification in busy labs
Supplied with calibration report from an ISO 17034 and ISO 17025 accredited laboratory
NIST/USA buffer value of pH 4.005 traceable to NIST standard reference materials
More About this Item
Certified Reference Materials (CRM) meet federal, state, and local requirements, providing standardized reference calibration for pH meters. Produced in compliance with A2LA ISO/IEC 17025:2005, ISO Guide 34, ISO 31, and ISO 35, CRMs ensure top-tier accuracy, documentation, and standards. They undergo extensive stability, transportation, and repeatability testing, with uncertainty (U) assigned from these evaluations. Calibration reports are issued by an ISO 17034 and ISO 17025 accredited lab. Environmental Express Oakton monitors the solution over 1 to 2 years and informs users of any changes.
pH 4 is a common high-range pH meter calibration point. All Oakton pH buffer solutions are manufactured under ISO 9000 quality guidelines and traceable to NIST standard (for meters with 0.01 resolution). A pH/temperature table is printed on the label for accurate calibrations. Available as Reference Materials (RM) and Certified Reference Material (CRM) grade. pH 4 buffer solution is available colored red for visual reference or clear. It is sold in individual 500-mL bottles. If unopened, shelf life of pH 4 is 2 years; once opened, use within 90 days. Store buffers away from direct sunlight.
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