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| Brand | METER |
|---|---|
| Origin | USA |
| Model | S2-421-SS (upward), S2-422-SS (downward) |
| Principle | Effective photosynthetically active radiation (PAR)-weighted reflectance measurement |
| Type | Portable canopy-mounted optical sensor |
| Spectral peaks | 532 ± 2 nm and 570 ± 2 nm |
| FWHM | 10 nm per channel |
| Field of view | 180° (S2-421-SS), 35° (S2-422-SS) |
| Cosine response error | ±2% @ 45°, ±5% @ 75° zenith angle |
| Calibration uncertainty | ±5% |
| Measurement repeatability | <1% |
| Long-term drift | <2% per year |
| Response time | <0.6 s |
| Operating temperature | −40 to +70 °C |
| Relative humidity range | 0–100% RH |
| IP rating | IP68 |
| Power supply | 5.5–24 V DC |
| Output | SDI-12 |
| Housing | Anodized aluminum with acrylic diffuser |
| Cable | 5 m shielded twisted pair, TPR jacket, stainless steel (316) strain relief |
| Weight (incl. cable) | 140 g (S2-421-SS), 110 g (S2-422-SS) |
| Dimensions | Ø30.5 × 37 mm (S2-421-SS), Ø23.5 × 43 mm (S2-422-SS) |
| Brand | METER |
|---|---|
| Origin | Germany (Manufactured by METER Group, formerly UMS) |
| Model | Dendrometer D1 |
| Type | Portable Mechanical Dendrometer |
| Measuring Principle | Linear Circumferential Displacement via Precision Spring-Loaded Band |
| Measurement Range | 10–66 cm stem diameter (extendable via tandem band configuration) |
| Band Material | Astralon® polymer |
| Thermal Expansion Coefficient | 75 × 10⁻⁶ / K |
| Operating Temperature | −30 °C to +60 °C |
| Band Dimensions | 2100 mm × 15 mm × 0.5 mm |
| Tensile Strength | 64 N/mm² |
| Static Friction Coefficient (on dry bark) | 0.5 |
| Band Mass | 16 g |
| Spring Mass | 7 g (short), 14 g (long) |
| Resolution | 0.02 mm (via vernier scale) |
| Compliance | Designed for long-term field deployment in GLP-aligned ecological monitoring |
| Brand | LI-COR |
|---|---|
| Origin | USA |
| Model | LAI-2200C |
| Principle | Effective Radiation Transmission Measurement |
| Type | Portable |
| Spectral Response Range | 320–490 nm |
| Field of View | 148° vertical, 360° horizontal |
| GPS Module | Integrated GPS RADIONOVA® RF Antenna (CEP ≤ 2.5 m, update rate: 1 Hz, cold start TTFF ≤ 37 s) |
| Weight | 0.454 kg (main unit, with batteries), 0.845 kg (sensor probe, with batteries) |
| Battery Life | ≥40 h (main unit, GPS + sensor active), ≥180 h (probe, typical operation) |
| Operating Temperature | –20 to +50 °C |
| Relative Humidity | 0–95% RH (non-condensing) |
| Compliance | CE-marked, FCC Class B |
| Brand | METER |
|---|---|
| Origin | USA |
| Model | S2-411-SS (upward-facing), S2-412-SS (downward-facing) |
| Principle | Spectral Radiance Ratio Measurement |
| Type | Portable Canopy Sensor Pair |
| Wavelength Peaks | 650 ± 2 nm (Red) and 810 ± 2 nm (NIR), FWHM: 10 nm each |
| Field of View | Upward: 180° (cosine-corrected hemispherical) |
| Downward | 30° full cone |
| Calibration Uncertainty | ±5% |
| Measurement Repeatability | <1% |
| Long-term Drift | <2% per year |
| Response Time | <0.6 s |
| Operating Temperature | −40 to +70 °C |
| IP Rating | IP68 |
| Housing | Anodized Aluminum with Acrylic Diffuser |
| Cable | 5 m shielded twisted pair, TPR jacket, stainless steel connector |
| Power | 5.5–24 V DC |
| Output | SDI-12 compliant |
| Weight (incl. cable) | 140 g |
| Dimensions | Ø30.5 × 37 mm (S2-411-SS), Ø30.5 × 34.5 mm (S2-412-SS) |
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