Phisherman wrote:
What are the best water alarms? Neede for an air conditioner overflow
tray on the attic floor, utility room, kitchen and under an aquarium.
Thanks.

For an AC, the normal case is another drain leading outside. If you see it
dripping when you mow the law, raise the alarm.

Aside:
I recently added a pipe with a cap on it to the evaporator unit. My plan is
to dump a cup or so of bleach in there once a year to bother the algae and
moss and fungus and whatever else grows there that stops up the drain.