Check the listing for details. Biopharm Buffer Calibration Solution (4) each 8oz bottles pH 4, 7, 10, and ES. Condition: New. Listed at 33.00 USD. Biopharm pH Calibration Solution Kit (4) each 8oz Bottles pH 4.0, 7.0, 10.0 and Electrode Storage Solution 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