Hanna Instruments HI 2221 pH benchtop meter

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A properly manufactured and maintained pH electrode will retain its measuring integrity for a longer time. As a result of many factors such as age, poor maintenance or improper handling, every electrode in time will lose its integrity.

The most common cause for pH measurement inaccuracies is an unclean or improperly cleaned electrode. This is very important to note because, during calibration, the instrument assumes that the electrode is clean and that the standardisation curve created during the calibration process will remain a valid reference until the next calibration.

The HI 2221 is a pH benchtop meter featuring Hanna Instruments’ Calibration Check diagnostics for both pH electrodes and buffer solutions during calibration. This instrument compares the characteristics of the pH electrode from one calibration to the next. In the case of large variances in the electrode condition, it alerts the user that the electrode needs to be properly cleaned prior to calibration and measuring.

This bench meter also features five-point calibration with seven standard buffers, automatic temperature compensation and GLP capabilities that allow for the storage and retrieval of all data regarding pH. With a built-in logging function, measurements are stored in non-volatile memory and can be transferred to a PC through the USB port.