What is the diameter of the white-colored ring? I need to know what size hole to drill.

The diameter of the threaded portion that is a part of the sensor is 16mm (<5/8"). The white soft plastic ring you refer to is 18mm diameter (<3/4"). The flange on that white plastic ring is 26mm (~1 1/8") diameter. Hope that helps.

What is the thread pitch on these?

I don't know the thread. It comes with its own nut.

Does this "Switch" contain physical contacts that open and close or is it some type of transistor?

This unit is an enclosed switch with two wires coming out. It can be installed to make/break contact in a fluid. I use it for water. When installed in one direction, it makes contact when full; when installed the other direction, it makes contact when empty. Thus, I have one switch at the top of a container collecting water to trigger when it is full; the other switch is at the bottom to trigger when it is empty.

Will these work under water?

Yes, that is how they work. In this installation the circuit is closed until the water is high enough to open it. As the water rises the float goes up, opening the circuit. When the circuit is closed, power goes to a 12Volt solenoid that allows water from an RO/DI unit to flow into the holding tank.

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Q: What is the thread pitch on these?

I don't know the thread. It comes with its own nut.

Q: Does this "Switch" contain physical contacts that open and close or is it some type of transistor?

This unit is an enclosed switch with two wires coming out. It can be installed to make/break contact in a fluid. I use it for water. When installed in one direction, it makes contact when full; when installed the other direction, it makes contact when empty. Thus, I have one switch at the top of a container collecting water to trigger when it is full; the other switch is at the bottom to trigger when it is empty.

Q: Will these work under water?

Yes, that is how they work. In this installation the circuit is closed until the water is high enough to open it. As the water rises the float goes up, opening the circuit. When the circuit is closed, power goes to a 12Volt solenoid that allows water from an RO/DI unit to flow into the holding tank.

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C**N

Works great - if you use it correctly

Works great with Arduino to control nutrient solution levels in hydroponic system. digitalRead(A0); returns "1" or "0." For my application, as sensor falls, a "1" is sent to the Arduino, which charges a DC-DC relay to activate normally closed solenoid valve until signal reads "0" again. I was hesitant to order after reading a lot of the reviews that insisted they go out after a short while, until I more closely examined the reviews. You cannot wire these directly between a source and a load (over about 5v) or they will predictably burn out! They are sensors, not switches, and as such must be "read" by another device that is then able to act upon it. As at least one other reviewer has noted, Arduino is a simple and safe platform for reading the signal and causing some other action based on the state of the sensor. If you need more info, Youtube it - "Arduino float switch"

24.02.2022

P**Y

Works well but the photos are misleading for the install

The sensors themselves work great so far and seem reliable. There are no instructions on how to properly install this so I had to dig around and look at other similar products and installation photos to figure it out. The photos show the silicone gasket backwards from what actually works. The flange goes on the inside, through the hole, then the nylon washer goes on, then the nut. These create a watertight seal on both sides.

9.07.2022

S**D

Floats my boat.

I used the float switch, a 5v usb power supply, and a relay to water my Chirstmas tree automatically. As a side note... sometimes aliexpress lists the breakdown voltage of float switches as their "Maximum" voltage when their actual specified operating maximum voltage is 50% of this... so you think 120V ac is safe to use with your float switch with the "maximum" voltage of 200V... and it is for 2 years... but... then, while you're sleeping, the switch gets stuck(electrically) closed and dumps 4 gallons of water under your Christmas Tree...

23.12.2025

M**.

Good and cheap

Works well for flood sensor on jobs. Just make sure you check continuity. Have had a couple bad out of the package.

31.05.2022

A**E

JUSTO!

ES EXACTAMENTE LO QUE PEDÍ

25.11.2025

S**F

Works great

Installed in auto water dispenser for i gallon water container for dog. When water gets very low the contacts close and a buzzer i rigged up goes off.

27.06.2021

G**3

So far, all of them work great

Very simple reed switch. So far, all of them work great. The supply an input to a microcontroller. These are very low current switch, keepnthat in mind. If you are looking to directly use it as an inline switch, I would suggest using it to feed a MOSFET or opto-isolator. I would recommend using a SCR if it is for AC current

16.10.2022

C**P

It worked fine for about a week then the first sensor quit ...

It worked fine for about a week then the first sensor quit working and the contacts were closed. I don't know if this is because I used it in a pool with chlorine (built my own solar skimmer) or just cheap sensors.

21.07.2018

Anndason 6 Pieces Black Water Level Sensor Aquarium Tank Side Mounted Horizontal Liquid Float Switch

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