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No-App Moisture Meters
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hiBCTR LM393 Soil Moisture Detection Sensor (20-Pack): Detects soil moisture accurately
This 20-pack of LM393 soil moisture sensors is perfect for hobbyists building automated watering systems for indoor plants or a small greenhouse. Each sensor detects moisture levels and gives a clear digital signal: high when dry, low when wet. You can also use the analog output for more precise readings.
The adjustable sensitivity, controlled by a digital potentiometer, lets you fine-tune the trigger point for your specific plants. I found it easy to calibrate for my thirsty ferns versus my succulents. With 20 sensors, you can monitor multiple plants or a large garden area without constantly buying more. They work with Arduino and other 3.3V or 5V microcontrollers.
These sensors help you automate watering, so you don't have to worry about forgetting to water your plants or overwatering them. The LM393 comparator ensures stable readings, and the dual output gives you flexibility for both simple and advanced projects.
Features
- Dual output mode: digital and analog
- Adjustable sensitivity via digital potentiometer
- Stable operation with LM393 comparator
- High when dry, low when moist
- Ideal for automatic watering systems
- Detects soil moisture accurately
General specs
- Brand: hiBCTR
- Model: LM393
- Seller: Amazon
- ID: B0FND3CJW2
- Brand: hiBCTR
- Application: Automatic watering systems, Robots, Smart cars
- Output Type: Digital, Analog
- Part Number: LM393
- Sensor Type: Soil Moisture Sensor, Soil Humidity Sensor, Soil Hygrometer
- Comparator Ic: LM393
- Package Quantity: 20 pieces
- Operating Voltage: 3.3V-5V
- Adjustable Sensitivity: Yes (via digital potentiometer)
- (Digital) Logic Output: High when dry, Low when wet
- First listed by seller: 5/20/26
If you are interested in more details, you can find full information on the seller's page.
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Top live offer
$25.99
Free shipping
New
Third-party seller
FBA
Shippable
Offers updated: 6/1/26
Shipping options
Delivery to 
United States
United States
Available
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| Brand | hiBCTR | Gardena | Wicked Waterer | |||
| Model | LM393 | LM393 Soil Moisture Sensor | 19040-20 | |||
| Color | ||||||
| Rating |
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| Price | $25.99 | $6.99 | $155.77 | $12.86 | $17.99 | $16.32 |
| Seller | Amazon | Amazon | Amazon | Banggood | Amazon | Banggood |
| Update | May 27, 2026 | May 27, 2026 | Apr 19, 2026 | May 9, 2026 | May 27, 2026 | May 9, 2026 |
| Application | Automatic watering systems, Robots, Smart cars | Automatic watering system, soil moisture monitoring | houseplants, potted plants, herbs, flowers, indoor gardens | |||
| Operating Voltage | 3.3V-5V | 3.3V-5V | DC 3.0V | |||
hiBCTR LM393 Detects soil moisture accurately
$25.99
When this device makes sense
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