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| Brand | Jingcheng Huatai |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Regional Classification | Domestic (China) |
| Model | HT-YL4 |
| Price | USD 780 (FOB) |
| Measurement Principle | Dual-wavelength optical absorption (650 nm & 940 nm) for SPAD-based chlorophyll estimation |
| Display | Backlit Chinese LCD (2.8″, 320×240) |
| Dimensions | 165 × 78 × 42 mm |
| Weight | 200 g |
| Power | Rechargeable 4.2 V Li-ion battery (2000 mAh) |
| Operating Temp. | –10 °C to +50 °C |
| Storage Humidity | ≤85% RH |
| Data Storage | 32 KB internal memory |
| Interface | USB 2.0 for PC data export |
| Measurement Area | 2 mm × 2 mm |
| Response Time | <3 s per reading |
| Brand | Jingcheng Huatai |
|---|---|
| Origin | Beijing, China |
| Model | HT-ZWK-1 |
| Stomatal Resistance Accuracy | ±20% within 0–50 s·cm⁻¹ (±0.2 s·cm⁻¹ reference) |
| Air Temperature Range | −20 to 80 °C, Resolution: 0.1 °C, Accuracy: ±0.2 °C |
| Relative Humidity Range | 0–90% RH, Accuracy: ±3% RH |
| PAR Range | 0–3000 µmol·m⁻²·s⁻¹, Accuracy: <5 µmol·m⁻²·s⁻¹ |
| Flow Rate | 0–1.5 L·min⁻¹ (±1% full scale |
| Leaf Chamber Dimensions | Standard 55 × 20 mm |
| Operating Temp/Humidity | 0–50 °C / 10–90% RH |
| Battery Life | 20 h continuous operation |
| Data Storage | 16 GB internal memory (~1 million readings) |
| Display | 3.5″ TFT color LCD, 800 × 480 resolution |
| Weight | 3 kg (host only) |
| Interface | USB data export, RS232 optional |
| Power | Rechargeable Li-ion, 6 h charge time |
| 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 |
| Brand | Jingcheng Huatai |
|---|---|
| Origin | Beijing, China |
| Model | HT-GC30 |
| Principle | Hemispherical Image Analysis (Fisheye Lens + CCD Imaging) |
| Type | Portable |
| Lens FOV | 150° (optional 180°) |
| Image Resolution | 2592 × 1744 |
| Zenith Angle Range | 0°–90° |
| PAR Spectral Range | 400–700 nm |
| PAR Measurement Range | 0–3000 µmol·m⁻²·s⁻¹ |
| Power Supply | External Rechargeable Li-ion Battery Pack |
| Interface | USB |
| Operating Temperature | −10 to 55 °C |
| Software | Plant Canopy Analysis System v3.x (with zenith/azimuthal zoning, dynamic thresholding, and georeferenced image tagging) |
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