This is certainly not wrong for the device described, however the ones I used to see (and owned) were simpler and did not require actually dipping into water. It was all done with the liquid rebalancing itself in the tube.
I used to have one on my desk where it could hit the Enter key often enough so it would appear I was working. I wasn’t goofing off (much), but our IT dept had a ridiculously short timeout period on our terminals.
