GroLine pH 4.01 Calibration Buffer (230 mL)

The HI7004-023 is a high-quality, NIST-traceable pH 4.01 calibration buffer designed to ensure optimal accuracy for pH sensors. Supplied with a Certificate of Analysis, each 230 mL bottle is hermetically sealed and molded under rigorous ISO conditions. The label clearly displays the lot number and expiration date, and the buffer remains stable for up to 5 years when unopened. It delivers a calibration accuracy of ±0.02 pH at 25 °C and includes a convenient temperature chart for quick reference across various temperatures. The bottle uses a color-coded label for easy identification and contains no dyes that could stain pH electrode junctions.