This is a High Gloss (Reference) Standard (also known as a tile or plate) which is compatible with all gloss meters.
This High Gloss Standard is ISO/IEC 17025:2017 calibrated (with Gloss Values supplied) for three angles 20°, 60° and 85°.
GT-HG3 is a High Gloss Standard at 20°, 60° & 85°. Manufactured from float glass, this standard is provided with an ISO/IEC 17025:2017 accredited certificate reporting the calibration values at 20°, 60° and 85°.
The typical values for a High Gloss Standard are as follows:
20° = 90GU
60° = 95GU
85° = 98GU