|  |  Touch Screen  Glan Thompson Prisim  Optional 200 mm peltier instrument  Option for different wavelengths  Option for measuring flowing sample with temperature control  Option for measuring corrosive samples | 
| Specification | IP-digi 1 | IP-digi 2 | IP-digi 3 | IP-digi 7 | IP-digi 8 | 
| Measuring range | ±90° | ±90° | ±90° | ±90° | ±90° | 
| Reasolution | 0.001° | 0.001° | 0.001° | 0.001° | 0.001° | 
| Accuracy | ±0.01° | ±0.01° | ±0.06° | ±0.04° | ±0.01° | 
| Reproducibility | ±0.003° | ±0.003° | ±0.003° | ±0.003° | ±0.003° | 
| Temperature Range | 0-100℃ | 0-100℃ | 0-100℃ | 0-100℃ | 0-100℃ | 
| Temperature resolution | 0.1℃ | 0.1℃ | 0.1℃ | 0.1℃ | 0.1℃ | 
| T.Control model | ---- | Peltier | Peltier | ---- | Peltier | 
| T.Control range | ---- | 10-50℃ | 10-50℃ | ---- | 10-50℃ | 
| T.Control accuracy | ---- | ±0.2℃ | ±0.2℃ | ---- | ±0.2℃ | 
| Sensitivity | Min0.5% | Min0.5% | Min0.5% | Min0.1% | Min0.5% | 
| Prism | polymer | polymer | polymer | Glan Thompson | polymer | 
| Light source | LED, 100000 hours | LED, 100000 hours | LED, 100000 hours | LED, 100000 hours | LED, 100000 hours | 
| Wavelength | 589nm | 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 | Optical rotation, Specific rotation, Concentration, International sugar scale | 
| Sample chamber | up to 200mm | up to 200mm | up to 200mm | up to 200mm | up to 200mm | 
| Interface | RS232, USB | 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 | 8 inch touch screen, Color LCD | 
| Database | 4000 groups data | 4000 groups data | 4000 groups data | 4000 groups data | 4000 groups data |