Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | M03 / M04 |
| Detection Type | Non-Contact Liquid Level |
| Output Signal | Digital Switch (High/Low) |
| Operating Voltage | 3.3V - 5V DC |
| PCB Color | Green |
| Interface Type | 3-Pin Header |
| Compatibility | Arduino, ESP32, STM32, Raspberry Pi |
| Response Time | < 1 Second |
| Mounting Style | External Tank Mounting |
| Application | Water Tanks, Sump Pumps, Aquariums |
Anonymous
Mar 30, 2026
Rating: 5/5
Great for IoT prototypes
Used this in a smart home water leak detector prototype. The digital output makes coding very straightforward. No issues after two weeks of continuous testing.
Anonymous
Mar 19, 2026
Rating: 4/5
Good value, sensitive adjustment needed
Works well for detecting water levels in my rain barrel. Had to tweak the sensitivity potentiometer slightly to avoid false triggers from condensation, but once set, it's reliable.
Anonymous
Mar 17, 2026
Rating: 5/5
Reliable and compact
Small form factor makes it easy to hide behind plastic tanks. The green PCB is clear and the soldering points are well-defined. Highly recommend for hobbyists.
Anonymous
Mar 17, 2026
Rating: 5/5
Beginner friendly
As someone new to sensors, this was very easy to set up. Plenty of tutorials online for the M03/M04 series. Worked on the first try with my ESP8266.
Anonymous
Mar 05, 2026
Rating: 4/5
Does the job
Solid sensor for the price. It detects water through thin plastic walls perfectly. Just make sure your power supply is stable to prevent fluctuating readings.
Anonymous
Mar 01, 2026
Rating: 5/5
Perfect for my aquarium project
This sensor works exactly as described. The non-contact feature is great because I don't have to worry about corrosion inside the tank. Easy to integrate with my Arduino setup.
Q: Does it work with saltwater?
A: Yes, it can detect saltwater. However, due to the higher conductivity of saltwater, you may need to adjust the sensitivity potentiometer to prevent over-sensitivity.
Q: Can this sensor detect water through a 5mm thick plastic container?
A: Yes, the M03/M04 module is designed for non-contact detection and can typically sense liquid through plastic containers up to 10mm thick, depending on the material density.
Q: What is the current consumption of this sensor?
A: The module typically consumes around 5mA to 10mA when active, making it suitable for battery-powered projects with sleep modes.
Q: Is this module waterproof itself?
A: The sensing area on the back is coated for protection, but the electronic components on the front (green side) are not waterproof. Please ensure only the sensing side contacts the environment or mount it externally.
Q: Are there any libraries available for Arduino?
A: Since this is a digital switch output, you do not need a specific library. You can simply read the pin state using the standard digitalRead() function in Arduino IDE.
Kimberly-Clark Wiper Paper, Industrial Cleaning Wipes for Oil and Grease, Factory & Laboratory Use
$963.52
Loose Gold Rutilated Quartz Beads, Donghai Agate, Chalcedony, Jade, Cat's Eye, Titanium Crystal, Aquamarine, White and Yellow Crystal Single Beads for Bracelets
$8.42
Faucet Drain Mat, Non-Slip Countertop Pad for Kitchen and Bathroom, Splash-Proof Sink Organizer, Thickened Mold-Resistant Silicone Mat
$3.78
New Pirelli Tire 255/40R20 101W AO PZERO PZ4 with Silent Cotton Original Fit for Audi A6L
$1,358.00
Oriental Pearl Dual Porcelain Jar Gift Set: Green Tea, Black Tea, Jin Jun Mei, Pu'erh Loose Leaf Tea in Porcelain Jars
$149.00
Purified Water Bucket Stand Inverted Water Dispenser Pump Simple Mineral Water Drinking Machine Press Pump
$10.80
New Children's Gouache Paint Brushes DIY Hand-Painted Graffiti Art Class Watercolor Acrylic Paint Brushes Bristle Round Tip Brush
$6.41
Natural Clear Quartz Fully Clean Untreated Faceted Round Rice Beads - For Women's Bracelets, Spacer Beads, and DIY Crafts
$6.63
Sponge Brushes for Kids' Crafts and Creative Painting - Student Art Stamping Tools, DIY Sponge Paintbrushes
$13.86
Jiuchenggong Liquan Ming Tang Dynasty Ouyang Xun Yao Mengqi Copybook, Regular Script Brush Calligraphy Workbook, 3 Volumes, 188 Pages
$17.90
Shaped Watercolor Paper Ticket Stubs - Blank Postage Stamp Bookmarks with Serrated Edges, Thickened 300g Premium Cotton Pulp, Fine Texture for Art Hand Painting, Easy Blending, High Absorbency, Wrinkle-Resistant - Perfect for Postcards and Creative Cards
$9.85
Naitong Automatic Retractable Air Hose Reel with PU Braided Hose for Pneumatic Tools and Car Detailing
$119.00
Premium Wall-Mounted Aromatherapy Empty Bottle – 100ML Plastic Square Diffuser Bottle with Wall-Mount Adhesive Sticker
$2.98
Leyingfang Floating Pen for Kids' Water Drawing, Colorful Water-Soluble Suspended Markers, Erasable Watercolor Pens
$13.80
Loose Rose Quartz Beads, Donghai Agate, Chalcedony, Jadeite, and Madagascar Pink Crystal for DIY Jewelry Making
$6.72
Expandable Stainless Steel Sink Rack, Multi-Function Kitchen Drain Board for Fruits, Vegetables, and Utensils
$14.90
Transparent Retainer Case Aligner Storage Box Portable Carry-On Squeeze Bag Orthodontic Appliance Rubber Band Cleaning Box
$18.50
Transparent Data Cable Organizer Bag for Travel - Portable Multi-Use Visible Storage for Digital Chargers and Cable Management
$7.36
Finished Seal Calligraphy Finished Stone Stamp Sellos Chines
$108.58
Chunfei Grocery Store Commuter Hard Fork Low-Beam Mountain Bike for Urban Roads, Suburbs, School, and Outings
$2,247.00
6-Cavity Large Square French Flower DIY Soap Silicone Mold for Essential Oil and Milk Soap
$4.93
Home Balcony Vegetable Planter - Self-Watering Plastic Pot for Strawberries and Succulents
$28.00
Pressure Swing Adsorption Nitrogen Generator - High-Purity Nitrogen Device for Heat Treatment
$36,456.00
6-Cavity 3D Rose Silicone Mold for DIY Soap Making Heat-Resistant Non-Stick Large Size for Milk Soap and Essential Oil Soap
$5.80
Traditional Handmade Baby Teething Rattle Sheepskin Wooden Clapper Newborn Toy Intangible Cultural Heritage
$29.85
Manufacturer Supply ZSJC02 Film Splicing Table, Alignment Table, Film Inspection Table
$4,484.00
Box-Type Oxygen Generator Export Equipment - Stable Nitrogen and Oxygen Production for Wastewater Treatment
$25,000.00
Wholesale Acrylic Paint Stick Set, 3ml x 12 Colors, Non-Toxic for Children's DIY and Street Art
$2.01
Cheese Processing Equipment - Small Pasteurized Fresh Milk Production Line, Fully Automatic Cheese Making Machine
$66,500.00
Household Mini Range Hood, Portable USB Desktop Smoke Extractor for Living Room Hot Pot & BBQ Odor Removal
$41.00
![[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set](https://www.gosteppe.com/cache/medium/product/208273/legacy-main-9ec245ebf781f65a434ba854.webp)
