Photosynthesis and Transpiration Meter
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| Brand | AZ (Beijing Aozuo) |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Product Origin | Domestic (China) |
| Model | EcoScope |
| Price | USD 145 (approx. based on ¥1000 at 1:6.9 exchange rate) |
| Brand | AZ (Beijing Aozuo Ecological Instruments Co., Ltd.) |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | ENVILog-Kc |
| Price | USD 1,400 (approx. based on ¥10,000 at 1 USD ≈ ¥7.15) |
| Brand | HORDE Electric |
|---|---|
| Origin | Shandong, China |
| Manufacturer Type | Direct Manufacturer |
| Country of Origin | China |
| Model | HD-ZT10 |
| Price | USD 2,750 (FOB) |
| Air Temperature Sensor | Swiss-made digital thermistor, -20–80°C, ±0.2°C accuracy, 0.1°C resolution |
| Leaf Temperature Sensor | Pt100 platinum resistance thermometer, -20–60°C, ±0.2°C accuracy, 0.1°C resolution |
| Relative Humidity Sensor | Swiss high-precision capacitive sensor, 0–100% RH, ±3% RH accuracy, 0.1% RH resolution |
| PAR Sensor | Silicon photodiode with cosine-corrected optical filter, 0–3000 µmol·m⁻²·s⁻¹, <5 µmol·m⁻²·s⁻¹ absolute error |
| Flow Control | Precision micro-flow controller, adjustable 0.0–1.5 L·min⁻¹, stability ±1% full scale |
| Leaf Chamber Dimensions | Standard 55 × 20 mm (customizable per request) |
| Operating Environment | 20–50°C ambient temperature, 0–100% RH (non-condensing) |
| Power Supply | Rechargeable 8.4 V DC Li-ion battery, ≥20 h continuous operation (no external light source) |
| Data Storage | 16 GB internal flash memory (expandable to 32 GB) |
| Data Transfer | USB 2.0 interface for direct PC export |
| Display | 3.5″ TFT color LCD, 800 × 480 resolution, sunlight-readable |
| Dimensions | 260 × 260 × 130 mm |
| Weight | 3.25 kg (main unit only) |
| 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 | Yuntang |
|---|---|
| Model | YT-ZT10 |
| Origin | Shandong, China |
| Manufacturer | Yuntang Instrument Co., Ltd. |
| Measurement Principle | Open-path diffusion-based gas exchange |
| Key Parameters | Leaf chamber temperature sensor (Heraeus, -20–80°C, ±0.2°C) |
| battery life | 20 h (DC 8.4 V Li-ion) |
| data storage | 16 GB internal (expandable to 32 GB) |
| display | 3.5" TFT LCD (800×480) |
| dimensions | 260×260×130 mm |
| weight | 3.25 kg |
| Units | Transpiration rate (Tr): mmol H₂O·m⁻²·s⁻¹ |
| Stomatal conductance (Gs) | mol H₂O·m⁻²·s⁻¹ |
| Stomatal resistance (Rs) | s·m⁻¹ |
| Accuracy | Tr ±1–5%, Gs ±5–10% |