The 191F Reflectance Measurement Heads are available in fixed angle of incidence configurations ranging from 0 to 45º.  A handheld unit with variable angle of incidence is also available, please contact us for further details.  The models are capable of first surface or total specular reflection on glass, plastic, metal or polished substrates, and can be used with sample sizes as thin as 0.15 mm. The spectral range is from 365nm to 1100 nm.