Check the listing for details. Biopharm pH Calibration Solution 2-Pack Quart (1 L) Bottles pH 4 and pH 7. Condition: New. Listed at 42.00 USD. Biopharm pH Calibration Solution 2-Pack Quart (1 L) Bottles pH 4 and pH 7 Buffer NIST Traceable Reference Standards for All pH Meters Want that feeling of confidence from doing things right? Get our accurate, unbiased, independent and scientifically documented calibration standards and be sure your meter is working correctly. These buffer calibration solutions are suitable for the calibration of all pH meters. Each production lot is manufactured in our own laboratory following carefully controlled written procedures and standardized against NIST standard reference materials (SRM) for high accuracy. The finished product is assigned a unique Lot number and expiration date. These products will have greater than one year shelf life when received. Certificate of analysis and traceability included. NIST Reference CalibratedColor Coded for Easy IdentificationLot Number and Expiration DatedIndividually bagged, 32 oz (1 Quart) Poly BottlesFor Pharmaceutical, Academic, Research, and Industrial Labs