The DeFelsko PRBGLS60 PosiTector Gloss Meter - Probe Only - Range: High Gloss, 60° value: > 70 GU, Measure with: 20° is the Portable gloss measurement for all surface finishes: Certificate of Calibration showing traceability to NRC for both the probe included: Conforms to ASTM C584/D523/D4039, ISO 2813/7668, JIS Z 8741, AS/NZS 1580.602.2