pH Buffer Pouches, 4.01

Choose from economical solution bottles or individually sealed pH buffer pouches. NIST traceable materials Labeled with pH vs. temperature tables for accurate calibration All Oakton pH buffer solutions are freshness dated, and standardized against NIST-traceable references to ensure quality. ± 0.01 pH at 25°C. Shelf Life: 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 Oakton pH Buffer Solution Bottles are labeled with the name and CAS number for all ingredients (for "Right-to-Know" requirements), and are supplied with an MSDS. Oakton Pouches are convenient, air-tight pouches with high-precision calibration standards. Ideal for field use- take them to your test site for on-the-spot calibration. Each box contains twenty 20mL pouches.