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Thank you for your interest in the HydroComm Water Quality Monitor. Calibration frequency is not fixed—you can recalibrate whenever the App prompts you or when you notice readings seem inaccurate. Please purchase calibration powders that match the required parameters: pH 6.86 at 25°C for 250mL solution. Should you need further assistance, please feel free to contact us at [email protected]. We're always here to help!
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