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Agricultural Sensors
NiuBoL Portable Soil Multi-Parameter Analyzer – compatible with Android/HarmonyOS 4.3 and below. One-click measurement of 8 key soil parameters: temperature, moisture, EC, salinity, NPK, and pH. APP supports data storage, Excel export, GPS positioning, and Chinese/English switching. High accuracy and stability, widely used in precision agriculture, greenhouses, and scientific research.
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The NiuBoL 8-in-1 Portable Soil Multi-Parameter Tester & Analyzer connects directly to a compatible smartphone through a Type-C/USB interface for rapid field soil measurement.
One probe measures soil temperature, moisture, electrical conductivity (EC), salinity, nitrogen, phosphorus, potassium and pH. The mobile APP provides real-time display, parameter configuration, data calibration, historical records, curve charts and Excel export.
The portable design is suitable for rapid soil testing, greenhouse cultivation, irrigation and fertigation management, agricultural research, plant cultivation and multi-point field surveys where a separate handheld meter or data logger is not required.
| Parameter | Range | Accuracy | Resolution |
|---|---|---|---|
| Soil Temperature | -40 to 80°C | ±0.3°C | 0.1°C |
| Soil Moisture | 0–100% | ±2% | 0.1% |
| Soil EC | 0–20000 μS/cm | ±3% | 1 μS/cm |
| Soil Salinity | 0–20000 mg/L | ±3% | 1 mg/L |
| Available Nitrogen | 0–1999 mg/kg | ±3% output specification | 1 mg/kg |
| Available Phosphorus | 0–1999 mg/kg | ±3% output specification | 1 mg/kg |
| Available Potassium | 0–1999 mg/kg | ±3% output specification | 1 mg/kg |
| Soil pH | 3–10 | ±0.2 | 0.01 |
NPK measurement note: The N, P and K channels provide empirical theoretical values derived from soil electrical conductivity and conversion coefficients. They are suitable for field reference and comparative monitoring rather than laboratory-equivalent nutrient analysis.
| 8-in-1 Measurement | Temperature, moisture, EC, salinity, N, P, K and pH |
| Portable Connection | Direct Type-C/USB connection to compatible smartphone |
| No Separate Meter | Smartphone functions as display and data-management terminal |
| APP Data Management | Real-time display, calibration, storage, history, curves and Excel export |
| Field Testing | Suitable for rapid measurements at multiple sampling locations |
The sensor connects to the smartphone charging port through the Type-C/USB connector. After the APP is installed and the sensor is recognized, measurement data can be displayed directly on the phone.
| Item | Support | Details |
|---|---|---|
| Android | Yes | Compatible smartphone with Type-C and OTG support |
| HarmonyOS 4.3 and Below | Yes | Supported |
| HarmonyOS 5.0 and Above | No | Not supported |
| Apple iOS | No | Not supported |
| OTG | Required | Some phones require OTG to be enabled manually |
| Function | Description |
|---|---|
| Real-Time Measurement | Displays all supported soil parameters |
| Parameter Configuration | Configure supported measurement settings |
| Data Calibration | Supports APP-based data calibration functions |
| Data Storage | Stores measurement records on the smartphone |
| Historical Data | Allows previous measurement records to be reviewed |
| Curve Charts | Displays recorded data as trend curves |
| Excel Export | Exports stored measurement records for further analysis |
| Language | Chinese / English switching |
| APP Update | Automatically checks for available updates at startup |
Download NiuBoL Portable Soil Sensor Android APP →
| Parameter | What It Indicates | Important Consideration |
|---|---|---|
| Temperature | Root-zone thermal condition | Useful for comparing locations and sampling periods |
| Moisture | Volumetric soil water condition | Good soil-to-probe contact improves repeatability |
| EC | Overall electrical conductivity of dissolved ions | Influenced by moisture, salts and fertilizer concentration |
| Salinity | Salt-concentration reference value | Useful mainly for comparison and trend monitoring |
| N / P / K | Empirical nutrient reference values | Not equivalent to laboratory nutrient analysis |
| pH | Soil acidity / alkalinity | Measurement consistency depends on soil conditions and probe contact |
The NPK channels are intended for rapid field reference and comparative monitoring.
The sensor obtains N, P and K reference values from soil electrical conductivity and corresponding empirical conversion factors. Soil composition, moisture, salinity and local environmental conditions can influence the resulting values.
| Application | Portable NPK Reading |
|---|---|
| Rapid Field Comparison | Suitable |
| Trend Monitoring | Suitable |
| Comparing Different Sampling Points | Suitable under comparable conditions |
| Laboratory-Accurate Nutrient Quantification | Not intended for this purpose |
| Precise Fertilizer Formulation | Should not be used as the sole data source |
| Step | Action | Description |
|---|---|---|
| 1 | Install APP | Install the NiuBoL APP on a compatible Android or HarmonyOS device. |
| 2 | Connect Sensor | Insert the sensor connector into the smartphone charging port. |
| 3 | Check OTG | Enable OTG in phone settings if the sensor is not detected automatically. |
| 4 | Select Sampling Point | Choose representative soil and avoid stones, large roots and abnormal wet or dry spots. |
| 5 | Insert Probe | Insert the sensing probe completely into the measured soil. |
| 6 | Read / Save Data | View measurements in the APP and save records when required. |
| Probe Insertion | Insert the sensing probe completely into the measured soil. |
| Chemical Environment | Avoid strongly corrosive environments. |
| Heat / High Voltage | Keep the sensor away from high-temperature and high-voltage sources. |
| Storage | Store in a dry, ventilated indoor environment. |
| Disassembly | Do not disassemble the sensor. |
| Feature | Portable Type-C/USB Tester | Fixed RS485 Sensor |
|---|---|---|
| Main Purpose | Field inspection and rapid testing | Continuous monitoring |
| Display | Smartphone APP | PLC, logger or monitoring platform |
| Power | Smartphone connection | External DC supply |
| Mobility | High | Fixed installation |
| Multi-Point Testing | Convenient | Requires multiple installed sensors |
| Automatic Remote Monitoring | Not the primary application | Suitable with gateway / data logger |
| Rapid Soil Testing | Precision Agriculture | Greenhouse Cultivation |
| Water-Saving Irrigation | Fertigation Monitoring | Flowers & Vegetables |
| Grassland & Pasture | Plant Cultivation | Scientific Experiments |
| Environmental Monitoring | Agricultural Field Surveys | Teaching & Demonstration |
| Problem | Possible Cause | Recommended Check |
|---|---|---|
| APP Installation Blocked | Phone installation-security restrictions | Allow installation according to the smartphone security settings |
| No Response After Connection | OTG disabled | Enable OTG in phone settings |
| Unstable Measurements | Probe not fully inserted or poor soil contact | Insert the probe completely into representative soil |
| Very Dry Soil | Weak conductivity and inconsistent electrode contact | Interpret EC and NPK values carefully under very dry conditions |
| NPK Differs from Laboratory Results | Different measurement method | Use the NPK channels as empirical field-reference values |
A1. It measures soil temperature, moisture, EC, salinity, nitrogen, phosphorus, potassium and pH.
A2. Yes. The sensor connects to a compatible Android smartphone through the Type-C/USB charging port.
A3. Yes. OTG support is required. Some smartphones require OTG to be enabled manually.
A4. No. Apple iOS devices are not supported.
A5. HarmonyOS 4.3 and below is supported. HarmonyOS 5.0 and above is not supported.
A6. Yes. Measurement records can be stored and exported as Excel files.
A7. No. The NPK values are empirical theoretical values derived from soil electrical conductivity and conversion factors and are mainly intended for field reference and comparative monitoring.
A8. Yes. The probe can be inserted completely into soil or buried for measurement. For continuous unattended online monitoring, a fixed RS485 monitoring system may provide a more suitable system architecture.
📱 NiuBoL Soil Sensor App
Connect the NiuBoL Soil Sensor to your Android smartphone via USB-C and instantly view soil data on your mobile device.
Download the App:
Soil_Multi_Parameter_Monitor_Manual_EN.pdf
The NiuBoL 8-in-1 Portable Type-C/USB Soil Multi-Parameter Tester provides rapid field measurement with smartphone-based display and data management. It is suited to mobile inspection and multi-point soil testing where immediate results are required.
For continuous automatic monitoring, NiuBoL also provides fixed RS485 soil sensors for connection to data loggers, LoRaWAN nodes, 4G gateways and private monitoring platforms.
The nitrogen (N), phosphorus (P), and potassium (K) values generated by this sensor are empirical estimates derived from soil electrical characteristics and conversion algorithms. They are not obtained through direct chemical analysis and should not be considered accurate measurements of actual soil nutrient concentrations.
NPK readings can be significantly influenced by soil moisture, salinity, electrical conductivity, soil composition, and other environmental factors. The displayed values may differ substantially from laboratory analysis results.
These NPK values are intended for general reference only and must not be used as the basis for fertilizer dosage calculations, soil fertility diagnosis, crop selection, or planting decisions.
For accurate determination of soil N, P, and K, laboratory chemical analysis is required.
The integrated soil pH measurement is designed primarily for general field reference.
The pH measurement accuracy is limited compared with professional, properly calibrated glass-electrode pH instruments. The specified accuracy of this integrated sensor is ±1 pH.
Consequently, the displayed pH values should not be regarded as laboratory-grade results or used as the sole basis for soil acidity correction, lime application, or other agricultural decisions requiring precise pH measurements.
For accurate soil pH analysis, a calibrated glass-electrode pH meter or a qualified soil-testing laboratory is recommended.
NPK and pH readings are intended for preliminary field reference only.
Do not rely on these readings alone for fertilization, crop management, planting decisions, or other agricultural applications requiring accurate soil chemical analysis.
For professional agricultural management, users should conduct appropriate laboratory soil testing and consult qualified agricultural specialists.
NiuBoL does not guarantee that the integrated NPK and pH reference values are equivalent to laboratory analysis results or suitable for precision fertilization and agricultural decision-making. Users are responsible for independently verifying soil nutrient and pH conditions before taking agricultural action. To the extent permitted by applicable law, NiuBoL shall not be liable for crop losses, fertilizer misapplication, or other consequential losses resulting from reliance on these reference values outside their intended use. This disclaimer does not affect applicable statutory rights.
Sensors & Weather Stations Catalog
Agriculture Sensors and Weather Stations Catalog-NiuBoL.pdf
Weather Stations Catalog-NiuBoL.pdf
Agriculture Sensors Catalog-NiuBoL.pdf
Water Quality Sensor Catalog-NiuBoL.pdf
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