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Cooperating with CMS Series Spectrophotocolorimeter and PM200 Photometer to test the photometers and colorimeters.
The main material of inner paint layer is pure barium sulphate and it will not become yellow even if for a long time.
Meet requirements of CIE pub.NO.84(1989). Fine diffuse reflection. Reflectance ρ≈0.8.
Variation of ρ(λ)<1.5%(380nm-780nm).
Multi-interface on the sphere, testing of photometers and colorimeters simultaneously.