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| Brand | Thermo Fisher Scientific |
|---|---|
| Origin | USA |
| Model | DO6+ |
| Measurement Principle | Galvanic Cell Electrode |
| Dissolved Oxygen Range | 0.00–19.99 mg/L (ppm) |
| Resolution | 0.01 mg/L |
| Accuracy | ±1.5% of full scale |
| Saturation Range | 0.0–199.9% |
| Resolution | 0.1% |
| Temperature Range | 0.0–50.0 °C (32–122 °F) |
| Temp. Resolution | 0.1 °C |
| Temp. Accuracy | ±0.5 °C |
| Salinity Compensation | 0.0–50.0 ppt (manual input, automatic correction) |
| Pressure Compensation | 500–1499 mmHg or 66.6–199.9 kPa (manual input, automatic compensation) |
| Calibration | Two-point (0% and 100% O₂) |
| Temperature Compensation | ATC/MTC (0.0–50.0 °C) |
| Electrode Type | Galvanic (self-polarizing) sensor |
| Response Time (t₉₅) | ≤60 s |
| Data Hold & Auto-Off | Yes (20 min inactivity) |
| Display | Single-line LCD |
| Input Interfaces | BNC + 2.5 mm audio jack |
| Power | 4 × AAA alkaline batteries |
| Battery Life | >700 hours |
| Dimensions (instrument) | 14 × 17 × 3.5 cm |
| Weight (instrument) | 200 g |
| Packaging Dimensions | 24 × 17 × 8 cm |
| Weight (shipping) | 0.55 kg |
| Brand | Thermo Fisher Scientific |
|---|---|
| Origin | USA |
| Model | 420D-01A |
| Instrument Type | Portable |
| Measurement Principle | Fluorescence-based (RDO) and Polarographic DO |
| pH Range | −2.000–20.000 |
| pH Resolution | 0.001 |
| pH Accuracy | ±0.001 |
| pH Calibration Points | Up to 5 |
| mV Range | ±2000.0 mV |
| mV Resolution | 0.1 mV |
| DO Concentration (RDO) | 0–50 mg/L |
| DO Accuracy (RDO) | ±0.1 mg/L (0–8 mg/L), ±0.2 mg/L (8–20 mg/L), ±10% of reading (20–50 mg/L) |
| DO Saturation | 0–500% |
| Saturation Accuracy | ±2% |
| Temperature Range | −5 to 105 °C |
| Temp Resolution | 0.1 °C |
| Temp Accuracy | ±0.1 °C |
| Data Storage | 5000 GLP-compliant entries |
| Protection Rating | IP67 (portable unit) |
| Interface | USB, RS232 |
| Power | 4×AA batteries or AC adapter |
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