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| Brand | METTLER TOLEDO |
|---|---|
| Origin | Switzerland |
| Model | SG6 |
| Temperature Range | 0.0–60.0 °C |
| Temperature Resolution | 0.1 °C |
| Temperature Accuracy | ±0.1 °C |
| Dissolved Oxygen Range | 0.0–600 % saturation / 0.00–99.00 mg/L |
| DO Resolution | 0.1–1 % / 0.01 mg/L |
| DO Accuracy | ±0.5 % |
| Atmospheric Pressure Range | 500–1100 mbar |
| IP Rating | IP67 |
| Data Storage | 200 GLP-compliant records |
| Display | Backlit custom LCD |
| Power Supply | 4 × AA alkaline or rechargeable batteries |
| Operating Environment | 5–40 °C, 5–80 % RH (non-condensing) |
| Interface | Infrared (IR) for data transfer to printer or PC (RS232/USB via optional adapter) |
| Brand | METTLER TOLEDO |
|---|---|
| Origin | Switzerland |
| Model | FG4 |
| Measurement Principle | Galvanic Cell (Zero-Polarization) |
| Temperature Range | 0.0–50.0 °C |
| Temp. Resolution | 0.1 °C |
| Temp. Accuracy | ±0.3 °C |
| DO Range (%) | 0.00–199.9% (extended to 400%) |
| DO Range (mg/L & ppm) | 0.0–45.0 mg/L (ppm) |
| DO Resolution | 0.1% / 0.01 mg/L / 0.01 ppm |
| DO Accuracy | ±1% of reading or ±1 mg/L (whichever is greater) |
| Salt Range | 0.0–50.0 ppt (0.1 ppt resolution) |
| Atmospheric Pressure Range | 375–825 mmHg / 500–1100 mbar / 500–1100 hPa |
| Pressure Resolution | 1 unit |
| Calibration Points | 2-point (0% and 100% O₂) |
| Data Storage | 30 measurements |
| Display | Backlit LCD with simultaneous readout of DO value, temperature, endpoint status, and compensation indicators |
| Enclosure Rating | IP54 |
| Power Supply | 4 × 1.5 V AAA batteries |
| Operating Environment | 0–40 °C, 5–80% RH (non-condensing) |
| Brand | Hach |
|---|---|
| Origin | USA |
| Model | HQ30d with LDO Sensor |
| Measurement Range | 0–20 mg/L (ppm) and 0–200% saturation |
| Resolution | 0.01 mg/L |
| Sensor Type | Optical (Luminescence-based) |
| Cable Options | 1 m, 3 m, 5 m, 10 m, 15 m, 30 m (standard & rugged variants) |
| Compliance | Designed for ASTM D888, ISO 5814, and EPA Method 4500-O G |
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