Environmental Express pH Buffer Bottles have pH/temperature tables printed on the labels for accurate calibrations. Manufactured under ISO 9000 quality guidelines and traceable to NIST standards. If unopened, shelf life is 2 years; once opened, use pH 4 and pH 7 within 90 days, pH 10 within 30 days.

Store buffers away from direct sunlight.

Color coded for quick visual reference:
pH 1.68 buffer in clear
pH 4.01 buffer in red
pH 7.00 buffer in yellow
pH 10.01 buffer in blue
pH 12.46 buffer in clear

Convenient 60-mL bottles come in a pack of five—ideal for field use. Grab one when you're on the go! Standardized against NIST-traceable pH references for meters with 0.01 resolution.

To obtain a Certificate of Analysis on each item within the pack, please visit each individual items' page and enter the lot number in the space provided. For example, type part number 00654-00 into the search box at the top web page, then scroll down on the page to the CERTIFICATE OF ANALYSIS box, and enter the lot number in the space provided.