|  |  2 level Software configuration  Standard FD Version for general use  Professional FD+ version for large lab use  Unique “red eye”monitoring system  User Management  Data Traceability  Audit Date safety in output & storage | 
| Specification | IP-digi FD 1 | IP-digi FD 2 | IP-digi FD 7 | IP-digi FD 8 | 
| Measuring range | ±90° | ±90° | ±90° | ±90° | 
| Reasolution | 0.001° | 0.001° | 0.001° | 0.001° | 
| Accuracy | ±0.01° | ±0.01° | ±0.04° | ±0.01° | 
| Reproducibility | ±0.003° | ±0.003° | ±0.003° | ±0.003° | 
| Temperature Range | 0-100℃ | 0-100℃ | 0-100℃ | 0-100℃ | 
| Temperature resolution | 0.1℃ | 0.1℃ | 0.1℃ | 0.1℃ | 
| T.Control model | ---- | Peltier | ---- | Peltier | 
| T.Control range | ---- | 10-50℃ | ---- | 10-50℃ | 
| T.Control accuracy | ---- | ±0.2℃ | ---- | ±0.2℃ | 
| Sensitivity | Min0.5% | Min0.5% | Min0.1% | Min0.5% | 
| Prism | polymer | polymer | Glan Thompson | polymer | 
| Light source | LED, 100000 hours | LED, 100000 hours | LED, 100000 hours | LED, 100000 hours | 
| Wavelength | 589nm | 589nm | 589nm | 589nm | 
| Measuring mode | Optical rotation, Specific rotation, Concentration, International sugar scale | Optical rotation, Specific rotation, Concentration, International sugar scale | Optical rotation, Specific rotation, Concentration, International sugar scale | Optical rotation, Specific rotation, Concentration, International sugar scale | 
| Sample chamber | up to 200mm | up to 200mm | up to 200mm | up to 200mm | 
| Measuring method | 20, editable | 20, editable | 20, editable | 20, editable | 
| Interface | RS232, USB | RS232, USB | RS232, USB | RS232, USB | 
| Display | 8 inch touch screen, Color LCD | 8 inch touch screen, Color LCD | 8 inch touch screen, Color LCD | 8 inch touch screen, Color LCD | 
| Database | >8000 groups data | >8000 groups data | >8000 groups data | >8000 groups data | 
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