CALL; A.WIHARTA 081294124885 085778084789 087784022201   Info Produk The Hanna Instruments HI 2221 Calibration Check pH/ ORP/ Temperature Benchtop Meter is a pH benchtop meter featuring our exclusive Calibration Check diagnostics for both pH electrodes and buffer solutions during calibration. The Hanna Instruments HI2221 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. The second feature is to detect if the calibration buffer solution is contaminated. After calibration, the probe condition is evaluated and an indicator is displayed informing the user of the overall pH electrode status. This instrument can measure using ORP electrodes ( pH channel input) , due to its capability to measure mV with a resolution up to 0.1 mV. The Hanna HI 2221 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.