The specification discloses a portable spectrophotometer (10) providing improved movement and control of the sample (S) during analysis. The unit (10) includes a base (12) and an upper assembly (14) supported on the base (12) for floating movement. Both a spectral measurement engine (20) and drive rollers...http://www.google.de/patents/US6198536?utm_source=gb-gplus-sharePatent US6198536 - Portable scanning spectrophotometer
