Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | M03 / M04 |
| Detection Type | Non-Contact Capacitive |
| Operating Voltage | DC 3.3V - 5V |
| Output Signal | Digital Switch (High/Low) |
| PCB Color | Green |
| Compatible Liquids | Water, Oil, Chemicals (Non-corrosive to container) |
| Container Material | Glass, Plastic, Ceramic (Non-metallic) |
| Response Time | < 20ms |
| Interface | 3-Pin Header (VCC, GND, OUT) |
| Application | Arduino, Raspberry Pi, IoT Projects |
Anonymous
Mar 29, 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's stable.
Anonymous
Mar 28, 2026
Rating: 4/5
Works well on plastic bottles
I tested this on various plastic containers. It works great on thinner walls. On very thick industrial plastic, the sensitivity drops a bit, but still usable with adjustment.
Anonymous
Mar 17, 2026
Rating: 5/5
Saved my final year project
Needed a safe way to monitor liquid levels without contaminating the solution. This non-contact sensor was the perfect solution. Highly recommend for academic projects.
Anonymous
Mar 12, 2026
Rating: 5/5
Easy to integrate with Arduino
Connected this to my Arduino Uno in minutes. The digital output makes coding very simple. It reliably triggers my pump when the water gets too low.
Anonymous
Mar 11, 2026
Rating: 5/5
Great value for money
Bought five of these for a smart home irrigation system. All of them worked out of the box. The non-contact feature is a huge plus for preventing corrosion.
Anonymous
Mar 03, 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 instantly without any wires touching the water. Very safe and reliable.
Q: How do I adjust the detection sensitivity?
A: There is a small blue potentiometer on the back of the PCB. Use a small screwdriver to turn it clockwise or counter-clockwise while testing to set your desired trigger point.
Q: Is the output analog or digital?
A: The standard output is digital (HIGH/LOW). However, some versions may allow analog reading if you tap into the comparator circuit, but out of the box, it functions as a switch.
Q: Does it work with oils or only water?
A: It works with various liquids including oils, provided the liquid has a dielectric constant different from air and the container is non-metallic. Sensitivity may vary by liquid type.
Q: Can this sensor detect water inside a metal tank?
A: No, this is a capacitive sensor designed for non-metallic containers like glass, plastic, or ceramic. Metal containers will interfere with the capacitance reading.
Q: What is the maximum wall thickness it can penetrate?
A: Generally, it works best with container walls up to 10mm thick, depending on the material density. Thinner walls provide more consistent results.
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