Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	M03 / M04
Detection Type	Non-Contact Capacitive
Operating Voltage	3.3V - 5.5V DC
Output Signal	Digital Switch (High/Low)
PCB Color	Green
Compatible Liquids	Water, Oil, Acidic Solutions
Container Material Support	Glass, Plastic, Ceramic (Non-metal)
Response Time	< 1 Second
Interface	3-Pin Header (VCC, GND, OUT)
Application	Arduino, Raspberry Pi, IoT Projects

6 reviews

Anonymous

Mar 31, 2026

Rating: 5/5

Perfect for my aquarium project

This sensor works exactly as described. I mounted it outside my glass tank and it detects the water level perfectly without any wires touching the water. Very reliable for automation.

Anonymous

Mar 28, 2026

Rating: 5/5

Great value for money

Bought two of these for a plant watering system. They are small, easy to wire up to an Arduino, and the non-contact feature prevents corrosion issues I had with old probes.

Anonymous

Mar 17, 2026

Rating: 5/5

Reliable digital output

Clean signal output makes coding very simple. No noise issues detected. Works well through thick plastic bottles which was my main concern.

Anonymous

Mar 16, 2026

Rating: 4/5

Solid component for students

We used these in a classroom setting for a robotics competition. They are durable enough for student handling and provide consistent results. One unit was slightly less sensitive than the others.

Anonymous

Mar 15, 2026

Rating: 5/5

Solved my leak detection need

Attached this to the bottom of my washing machine supply line container. It triggers an alert immediately when water is present. Simple and effective solution.

Anonymous

Mar 08, 2026

Rating: 4/5

Good sensitivity, needs calibration

The module is sensitive and responsive. You do need to adjust the potentiometer on the back to get the threshold right for your specific container thickness, but once set, it stays consistent.

5 FAQ

Q: Can this sensor detect liquid levels through a metal container?

A: No, this is a capacitive sensor designed for non-metallic containers such as glass, plastic, or ceramic. Metal containers will interfere with the capacitance reading.

Q: Does this work with corrosive liquids like acid?

A: Yes, since the sensor does not come into direct contact with the liquid, it can safely detect levels of corrosive liquids provided they are in a compatible non-metal container.

Q: How do I adjust the sensitivity?

A: There is a blue potentiometer on the back of the PCB. Use a small screwdriver to turn it clockwise to increase sensitivity or counter-clockwise to decrease it while testing with your target liquid.

Q: Is this module waterproof?

A: The sensing area is conformal coated and resistant to moisture, but the electronic components and pins are not fully submersible. Only the sensing face should be exposed to potential splashes.

Q: What is the maximum wall thickness of the container it can penetrate?

A: Generally, it can detect through container walls up to 13mm thick, though sensitivity may vary depending on the material density and liquid type.

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