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| Brand | Jingcheng Huatai |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | HT-ZWK-II |
| Price | USD 3,950 (FOB Beijing) |
| Measurement Principle | Steady-state diffusion-based leaf chamber method |
| Key Metrics | Transpiration rate (mmol H₂O·m⁻²·s⁻¹), stomatal conductance (mol H₂O·m⁻²·s⁻¹), stomatal resistance (s·m⁻¹), leaf temperature (°C), air temperature (°C), relative humidity (% RH), photosynthetically active radiation (PAR, µmol·m⁻²·s⁻¹) |
| Temperature Sensors | Swiss-made digital thermistors (air: −20–80 °C, ±0.2 °C |
| leaf chamber | −5–55 °C) |
| Humidity Range | 0–90% RH, ±3% RH accuracy |
| PAR Sensor | Calibrated silicon photodiode with cosine-corrected filter, 0–3000 µmol·m⁻²·s⁻¹, <5 µmol·m⁻²·s⁻¹ uncertainty |
| Flow Control | Precision glass rotameter, 0–1.5 L·min⁻¹, stability ±0.2% (0.2–1.0 L·min⁻¹) |
| Leaf Chamber Dimensions | Standard 55 × 20 mm (customizable) |
| Display | 3.5″ TFT color LCD, 800 × 480 resolution |
| Data Storage | 16 GB internal flash memory (~1 million readings) |
| Interface | USB 2.0 for direct data export |
| Battery | Rechargeable Li-ion, 20 h continuous operation, 6 h full charge |
| Operating Environment | 0–50 °C, 10–90% RH |
| Weight | 3.0 kg |
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