[joshvm]

The trick with waterproofing is that it's easy to do rainproof enclosures, but much harder to make fully submersible things.

For measuring water parameters I would be tempted to use a rugged box for the Pi and then cable (via a removable connector) to something you put in the water. Basically design a probe like the device you linked. The fewer parts that need to be fully waterproof the eaiser life gets.

[thisnews]

Absolutely! There have been too many attempts by management to push our technical team towards devices with replaceable batteries as a means of reducing operational expenditure. Such loggers fail, often.