35419-28 Includes Only:PH 550 Benchtop pH Meter Kit (WZ-35419-30) : Plastic 3-in-1 combination pH electrode, electrode holder and 9 VAC power adapterBuffer Pack; 500 mL of each pH 4.01, 7.00, and 10.01 (WZ-05942-10) Features:Automatically recognizes calibration solutionsCompact design saves valuable benchtop spaceData logging allows you to store and recall up to 50 groups of dataIP54-rated housing is dust- and spill-proofBundled kit for convenience and savings!All Oakton pH buffers are traceable to NIST standard reference materialsBuffer solutions help you calibrate pH instruments to ensure accuracyThe PH 550 benchtop pH meter features a microprocessor chip that provides automatic temperature compensation, data storage, parameter setup, and Max/Min reading the display. The meter offers a pH range from 0 to 14 and a three-point automatic calibration, with the ability to recognize standard buffer solutions (USA or NIST series) . The advanced digital processing technology improves meter response time and measuring accuracy. A stable reading display icon appears when the measuring value is stable. The 3-in-1 combination pH electrode measures pH and temperature simultaneously. The compact meter includes a detachable electrode holder and three bottles of pH buffer solution. It has a dustproof and spillproof rating of IP54. Connectors are protected by silicone seal caps.Oakton pH Buffer Bottles have pH/temperature tables printed on the labels for accurate calibrations:Manufactured under ISO 9000 quality guidelines and traceable to NIST standardsIf unopened, shelf life is 2 years; once opened, use pH 4 and pH 7 within 90 days, pH 10 within 30 daysStore buffers away from direct sunlight.Color-coded for quick visual reference: pH 4.01 buffer in redpH 7.00 buffer in yellowpH 10.01 buffer in blue.