• Oakton pH Buffer Solutions have pH/temperature tables printed on the labels for accurate calibrations (not on 60-mL, but included as insert) • 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 • Buffer Options: - pH 1.68 buffer available in clear - pH 4.01 buffer available in red - pH 6.86 buffer available in clear - pH 7.00 buffer available in yellow - pH 9.18 buffer available in clear - pH 10.01 buffer available in blue - pH 12.46 buffer available 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. Store buffers away from direct sunlight.