Check the listing for details. Biopharm pH Calibration Kit (2) each 250 mL Bottles pH 7 and pH 10 Buffer. Condition: New. Listed at 17.99 USD. Biopharm pH Calibration Kit (2) each 250 mL (8.4 fl oz) Bottles pH 7 and pH 10 Buffer NIST Traceable Reference Standards for All pH Meters 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, 250 ml (8 oz) Poly BottlesFor Pharmaceutical, Academic, Research, and Industrial Labs