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| Brand | Apogee |
|---|---|
| Origin | USA |
| Model | MC-100 |
| Measurement Principle | Dual-wavelength (653 nm & 931 nm) transmittance ratio |
| Display Units | μmol/m² (default), CCI, SPAD |
| Measurement Area | 63.6 mm² (9.0 mm diameter), 19.6 mm² (with optional shade hood for leaves <5 mm wide) |
| Resolution | ±10 μmol/m² (typical plants), 0.1 CCI |
| Linearity | ±1% |
| Repeatability | ±1% |
| Measurement Time | <3 s |
| Data Storage | 8 MB (up to 160,000 measurements |
| Interface | Mini-B USB, RS-232 (GPS-compatible) |
| Display | 50 mm × 15 mm graphical LCD, 8-button navigation |
| Operating Temperature | 0–50 °C |
| Power | 9 V alkaline battery |
| Auto-shutdown | After 4 min of inactivity or no data download |
| Dimensions | 152 × 82 × 25 mm |
| Weight | 210 g |
| Brand | Active Spectrum |
|---|---|
| Origin | USA |
| Model | CM-1000 |
| Measurement Principle | Dual-wavelength (700 nm & 840 nm) reflectance-based relative chlorophyll index |
| Measurement Area | 1.35 cm Ø at 30.5 cm distance |
| Effective Measurement Range | 0–999 (unitless relative chlorophyll index) |
| Repeatability | ±5% of reading |
| Measurement Interval | 2 seconds per reading |
| Detector | Four photodiodes (2 for sample reflectance, 2 for ambient light compensation) |
| Data Storage | 1,350 records with GPS metadata |
| Power | Two AAA alkaline batteries (~3,000 measurements per set) |
| Operating Distance Range | 30.5 cm to 183 cm |
| Weight | Handheld, lightweight ergonomic design |
| Environmental Compensation | Automatic ambient light correction |
| Connectivity | Optional GPS integration via serial interface |
| Compliance | Designed for field-deployable agronomic and ecological monitoring in accordance with ISO 11097 (optical plant sensors), ASTM E2912 (standard practice for spectral reflectance measurements of vegetation), and GLP-aligned data integrity workflows |
| Brand | WD Precision |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | WD-JL1000 |
| Price | USD 5,600 (FOB Beijing) |
| Core Technology | Granier-type Thermal Dissipation Probe (TDP) |
| Data Logger | Campbell Scientific CR1000x |
| Sensor Compatibility | TDP30 / TDP50 / TDP80 stem flow probes |
| Power Management | Adaptive low-power operation with AVRD voltage regulation |
| Environmental Rating | -40°C to +70°C (standard), -55°C to +85°C (extended) |
| Data Storage | Up to 400 days at 1-hour interval (128 MB internal + microSD up to 16 GB) |
| Communication | RS-232/RS-485, Ethernet 10/100 Mbps, USB-micro B, CS I/O, CPI/CDM |
| Input Capacity | 16 single-ended / 8 differential analog channels |
| Compliance | Designed for GLP-aligned field deployments |
| compatible with ASTM E2899-22 (Standard Guide for In Situ Sap Flow Measurement) and ISO 16634-1 | 2021 (Plant physiology — Sap flow measurement — Part 1: Thermal dissipation method) |
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