| Model | Function |
| AD-6A | 1. Test N,P,K, organic matter, soil pH, soil salinity; 2. With storage function; 3. Built-in the amount of nutrients needed for growth of 73 kinds of crops, can provide guidance for fertilizing amount according to needs; 4. With printing function |
| AD-6PC | Based on AD-6A, with a software, be able to connect to computer for data storage |
| AD-7PC | On the basis of AD-6PC, but add one more parameter: soil moisture |
| Soil Nutrient technical parameter | |
| Stability | Absorbency of light drift＜0.003 |
| Repeatability | Absorbency of light＜0.005 |
| Linearity errors | Red light for Copper sulfate, and blue light forpotassium bichromate ＜ 3.0% |
| Sensitivity | Red light≥4.5x10-5 Blue light≥3.17*10-3 |
| Wavelength range | Red light 620±5nm; Blue light440±5nm |
| Anti-Knocking performance | qualified |
| pH technical parameter | |
| Testing range: | 1-14 |
| Error | ±0.1 |
| Salinity technical parameter | |
| Testing range | 0.01% -1.00% |
| Error | ±5% |
| Soil moisture technical parameter | |
| Moisture unit | % (m³/m³) |
| Accuracy | ±2% |
| Moisture content rate testing range | 0-100% |
| Instrument technical parameter | |
| Display mode | LCD display |
| Interface | USB |
| Working environment | 0~40℃ 35~85%RH |
| Alternating current (AC) | 220V-240V, 50Hz, adapter: 12V/3A |
| Size | 32*28*11cm |
