Electrode logbook
Record slope and zero point of every calibration - the logbook draws the trend, projects it forward and reminds you of the next calibration.
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Slope and zero point only tell their full story over time: an electrode falling from 99 to 94 percent in three months will need replacing soon - one sitting stable at 96 will not for a long while. This logbook keeps your calibration values and makes the trend visible. The values come from your meter or from the electrode check.
Your data stays with you. The logbook stores everything exclusively in your browser's local storage - nothing is transmitted, there is no account. The data is tied to this browser on this device; back up important histories via CSV export. Clearing the site data in your browser also clears the logbook.
Why keep a logbook?
A single calibration says how the electrode is doing today - only the series shows where it is heading. In the lab, seamless documentation is part of good practice anyway; on pool dosing systems and CO₂ controllers it replaces a rude awakening with planned replacement. And in a warranty case, the history shows whether an electrode weakened early or simply reached the end of its natural life.
How often to calibrate?
Practical guide values - in doubt, the medium, your accuracy needs and your own trend curve decide:
| Application | Recommended interval | Note |
|---|---|---|
| Laboratory & pharma | Before every measurement series | At least daily in continuous operation |
| Food production | Daily to weekly | Documentation per HACCP |
| Pool with dosing system | Every 2-4 weeks | Additionally at every season start |
| Aquaristics / CO₂ control | Monthly | Immediately after every electrode change |
| Industrial process | Weekly to monthly | Check after CIP/SIP cycles |
| Occasional handheld use | Before every use | Especially after longer storage |
How to read the trend
A steadily falling slope is normal ageing of the glass membrane - the forecast shows how much time is left. A sudden drop or a jumping zero point, however, points to fouling or junction problems: then cleaning and the troubleshooting guide help before you think about replacement.