This is a Gloss (Reference) Standard (also known as a tile or plate) which is compatible with all gloss meters.
The Specia High Quality Gloss Standard is calibrated for: High Gloss - three angles 20°, 60° and 85°. Semi Gloss - one angle 20°, 60° or 85°.
The GT-SSBUD has the values of a high gloss standard however it is higher quality.
* The values mentioned are typical values and that each individual tile will differ slightly