pH probe testing

[sgbaird]

See the two sub-issues. Based on internal thread: https://accelerationc.slack.com/archives/C06NYTX653J/p1756397085447139?thread_ts=1756397085.447139&cid=C06NYTX653J

[sgbaird]

@owen-melville If you find a different, suitable product, would you mind linking here?

(UPDATE: Atlas scientific needs to be continually immersed during storage it seems, and the InLab 710 doesn't have pH it seems)