Thermo Scientific Orion® pH 9.18 Buffer Bottle, 5 x 60mL. For 3-Star pH meters. The Thermo Scientific Orion® buffer bottle is ideal for accurate, reproducible pH calibrations. All Thermo Scientific Orion® pH buffers are traceable to NIST standard reference materials. Manufactured under ISO 9000 quality standards. pH/temperature table printed on label for accurate calibrations and NIST traceability. Clear liquid. Soluble. Specific gravity: 1.0. Boiling point: 101°C. pH: 9.18. Size: 60mL. 5 Bottles/Pack. Thermo Scientific Orion® #: 9191860.