Lab Safety Supply Inc pH 4.00 Buffer Solution 20mL PK20

pH 4.00 Buffer Solution 20 mL Pack

This product is a lab-grade pH 4.00 buffer solution supplied in twenty individual 20 mL containers. It is intended for technicians and laboratory staff who need a reliable reference standard for calibrating pH meters and electrodes. The solution carries a NIST-traceable calibration certificate and has a 24-month shelf life. The plastic boxes are classified as not regulated for transport.

Replaces expired or depleted calibration standards

Laboratories should replace buffer solutions once the 24-month shelf life has passed or when containers have been opened and risk contamination. Fresh solution restores meter accuracy and prevents measurement drift that can affect test results. The jump is worth it whenever calibration checks fall outside acceptable tolerances or when audit requirements demand current NIST-traceable documentation.

Suits labs needing NIST-traceable pH 4.00 reference

This pack suits quality-control labs, environmental testing facilities and educational institutions that perform routine pH meter calibration. It is not for users who require different pH values, larger volume bottles or solutions without the listed chemical components such as potassium hydrogen phthalate and methanol. Buyers needing non-hazardous classification for all shipping zones should verify local regulations.