2 Pcs Side Mounted Horizontal Liquid Float Switch Water Level Sensor Black for Aquariums Tank DPL-1-BK

Do not use these where critical function is required. Neither float switch worked most of the time; often the float would be in the activation position under water and would not work until jostled by hand several times.

Out of the packaging the switch stayed on indefinitely when activated. Both switched in the package did this. It would only turn off when hit with a screw driver. Piece of junk.

works great, you really need to be aware that these must trigger a relay which then sends power to the device you want to power.. these are not rated to take much current and are only meant to drive a relay at 5v and a few hundred milliamps by my experiments.

I like how simple and foolproof the design is. There is a magnetic switch in the base and a magnet in the articulated, floating section. You can mount it either for normally-open or normally-closed operation. The only thing that kept me from giving it 5 stars is that it's larger than I'd think necessary. Fortunately size isn't usually a concern.

Its does wats it supposed to do! I use mine as a low cut off switch on my pressure washer buffer tank..

These switches work for a couple of days. ALL of them go bad. I use them to turn on and off tiny motors in water. As they quit working, they will not allow the motor to shut off, thus burning them out on low water limit. Do not buy. You will be disappointed

I'm using these on Keurig-style coffee makers to automatically refill the water tanks. The size is perfect to fit the small reservoirs. The quality is fine, and the silicone gasket seals well. My issue though is that they have an arrow stamped on them, which I would naturally assume means "this way up", but just the opposite. So I had already drilled and installed them in the reservoirs at a level where the switch would break the circuit when the float is parallel, but they don't work that way. The circuit breaks when the float is OFF parallel, so I had to turn them the other way. Luckily I had just enough room for the float to rise and didn't ruin the reservoirs, but the full level is now a bit higher than I'd like .

Worked well for my project no issues. Rubber oring chemical resistant so far.

Great little float switches, have been building a couple of controllers for some outdoor fountains, so that if/when they run low on water, due to evaporation, wind or animal consumption, it will trigger a value and/or pump to fill the fountain back up. Super easy to work with and install. Easy to use as either Normally Open or Normally Closed simply by flipping them upside down.