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| Brand | Davis |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Product Category | Imported Instrument |
| Model | 6470 |
| Instrument Type | Soil Temperature Sensor |
| Sensor Element | Precision Thermistor |
| Measurement Range | −40 to +65 °C |
| Accuracy | ±0.5 °C |
| Resolution | 1 °C (user-selectable) |
| Time Constant | 100 s (in air), 28 s (in liquid) |
| Cable Length | 4.6 m |
| Cable Gauge | 22 AWG, direct-burial rated, tin-plated conductors |
| Enclosure Material | 316 stainless steel body with epoxy encapsulation and vinyl strain relief |
| Probe Dimensions | 8 mm diameter × 64 mm length |
| Weight | 128 g |
| Output | Analog resistance (variable resistor), 2-wire configuration (black = common, white = signal) |
| Brand | RainWise |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Product Category | Imported Instrument |
| Model | SM |
| Instrument Type | Soil Water Potential (Tensiometric) Sensor |
| Measurement Range | 0–200 cbar |
| Resolution | 1 cbar |
| Sensing Principle | Electrical Resistance (Calibrated to Matric Potential) |
| Cable Length | 4.6 m |
| Weight | 103 g |
| Brand | Davis |
|---|---|
| Origin | USA |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Imported |
| Model | 6440 |
| Instrument Type | Soil Water Potential (Tensiometric) Sensor |
| Sensor Principle | Electrical Resistance (Watermark® Technology) |
| Cable Length | 4.6 m (standard), up to 300 m (with 18 AWG UF cable) |
| Housing Dimensions | 22 mm Ø × 76 mm |
| Weight | 103 g |
| Output Resolution | 1 cbar |
| Measurement Range | 0–200 cbar |
| Update Interval | 62.5–75 s |
| Compatible Base Stations | Davis 6345 Wireless Soil & Leaf Wetness Station |
| System Integration | Vantage Pro and Vantage Pro2 Weather Stations |
| Cable Specification | Two-conductor, tinned, stripped Watermark®-compliant wire |
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