Float Switch to Cutoff AC Power if Low Water Level in ATO Container

[EricR]

Any recommendations for a float switch that cuts-off AC power when water level in ATO container gets too low?

Maybe something like one of these "tethered" floats but they look pretty sloppy/imprecise so wondering what others use and like:

PumpSpy Tethered Float Switch

WaterBoss Tethered Float Switch


Details in case it matters:
-- 40 gallon breeder (NO sump)
-- Tunze Nano Osmolator 3152 -- surprised it doesn't have some kind of low water level (or "dry") auto shut off
-- Cheapie 11 gallon polypropylene trash can with lid for ATO container jammed behind the tank -- no room anywhere else

 

[Sean Clark]

This will get the job done and won't be "sloppy" like you mentioned.

Maxmoral 2pcs M16 Water Level Sensor Flow Inductance Water Pump Controller DC 110V Side Mount Horizontal Liquid Float Switch for Aquariums Fish Tank Hydroponics Pool

 

[EricR]

This will get the job done and won't be "sloppy" like you mentioned.

Maxmoral 2pcs M16 Water Level Sensor Flow Inductance Water Pump Controller DC 110V Side Mount Horizontal Liquid Float Switch for Aquariums Fish Tank Hydroponics Pool

Thanks,,, will check 'em out (and, as an added bonus, they're super cheap).

Ideally, I was looking for something that's fully submersible with the wires running out the top of the ATO container -- just because the container I'm using is contoured (not flat) and pretty flimsy so avoiding drilling through and sealing would be better,,, but we'll see.