| 1. | Measuring accuracy must be comparable with those of an air bearing rheometer |
| 2. | Construction and design must allow exact measuring results also in industry laboratories without ideal ambient conditions (f.e. without clean air or in machinery and production rooms), where air bearing rheometer normally cannot be used |
| 3. | Price of such rheometer must be cheaper than an air bearing rheometer, so that it is payable also out of a smaller budget of quality control laboratories |