With three probes available there are three measurement angles to suit any application.
GLS 60 degrees - Suitable for most gloss applications, preferred angle for semi-gloss
GLS 20, 60 degrees - Suitable for high- to semi- gloss applications / Calculates Haze (Haze Index)
GLS 20, 60, 85 degrees - Suitable for high-, semi-, and matte- gloss applications / Calculates Haze (Haze Index)