Groline pH 4.01 Calibration Solution

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high quality pH 4.01 calibration buffer that is NIST traceable and supplied with a Certificate of Analysis. Hanna calibration buffers have the lot number and expiration date clearl y marked on the label and are air tight with a tamper-proof seal to ensure the quality of the solution. Hanna's line of technical calibration buffers have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened bottle. Supplied with Certificate of Analysis Accuracy of +/- 0.02 pH @ 25°C Temperature chart of the actual pH value at various temperatures printed on each bottle Show more