Probes

Wavie reads five probes. Four are included with the Beta Kit. The dissolved oxygen probe will be sold separately at launch; the input for it is already on the board.

Probe	Included	How it is read
pH	Yes	Glass electrode, isolated input
ORP	Yes	Electrode, isolated input
Salinity	Yes	Conductivity probe
Temperature	Yes	Digital probe
Dissolved oxygen	Sold separately	Galvanic probe, isolated input

Temperature comes first

The Beta Kit includes calibration fluids for the four probes, and the app walks you through calibrating each one.

Temperature is read before anything else, because pH, salinity and dissolved oxygen all need it for correction. If the temperature probe is missing, the readings that depend on it are withheld.

pH

Calibrated with buffer solutions: pH 7 always, plus pH 4, pH 10, or both. Three points is best. After calibration Wavie reports the health of the electrode as a percentage of the ideal response, so you know when it is wearing out.

ORP

Calibrated at one point against a standard solution.

Salinity

Wavie measures conductivity and converts it to salinity using the standard seawater formula, corrected for temperature.

Dissolved oxygen

The probe's signal is converted using a table of oxygen saturation against temperature, then corrected for salinity. Seawater holds about 20% less oxygen than fresh water, so a reading without that correction would be too high.

Honest readings

Every reading carries its state: uncalibrated, factory default, calibrated, or stale. A probe that is unplugged or out of range shows as having no reading. Wavie does not show an old or invented value as if it were live.