Digital pH meter
Hanna Instruments
The HI 3221 features up to 5 point calibration with a choice of 5 custom and 7 standard buffers. Users are guided through calibration with graphic prompts on the LCD display. These advanced meters also feature a user selectable Outside Calibration warning as well as a user selectable Calibration Time-out warning.
This meter is provided with a new diagnostic feature to allow users to dramatically improve measurement reliability. Calibration Check 174 diagnostics system ensures accurate readings every time by alerting users of potential problems during the calibration process.
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