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| Brand | DoctorWater |
|---|---|
| Origin | Hunan, China |
| Model | Dr-T9904 |
| Measurement Method | Photometric (UV-Vis Spectrophotometry) |
| Range | 0–100 mg/L TN |
| Accuracy | ≤ ±5% |
| Detection Limit | 0 mg/L (as reported |
| Resolution | 0.001 Abs |
| Wavelength Range | 340–900 nm |
| Wavelength Accuracy | ±1 nm |
| Wavelength Repeatability | <0.2 nm |
| Spectral Bandwidth | 4 nm |
| Transmittance Error | ±0.5% |
| Transmittance Repeatability | ≤0.2% T |
| Optical Stability | ≤±0.005 Abs/20 min |
| Light Source | Imported Cold LED (Lifespan >100,000 h) |
| Display | 8-inch HD Capacitive Touchscreen |
| Sample Holders | Rotatable Cuvette Holder (360°), Dual Cuvette Positions (10 mm & 30 mm pathlength), 4 Independent Digital Electrode Ports |
| Calibration | Single- and Multi-point Standard Curve Generation |
| Preloaded Curves | 1,000 Method-Specific Calibration Curves |
| Data Storage | 1,000,000 Records with Timestamp, Operator ID, and Batch Traceability |
| Output | Thermal Printer, USB Export (CSV), On-screen Graphing & Filtering |
| Housing | Corrosion-Resistant ABS Enclosure |
| Dimensions | 392 × 315 × 170 mm |
| Weight | 4.4 kg |
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