November 4, 2019 by INDO SERVICES INDO SERVICES Reference SpheresReference Spheres with base plate (Type A) Search Order No. Ball Material Ball-∅ (mm) 15 NRKA Ceramic 15.0 20 NRKA Ceramic 20.0 25 NRKA Ceramic 25.0 30 NRKA Ceramic 30.0 25 NRSA Steel 25.0 Reference SpheresReference Spheres (Type B) Search Order No. Ball Material Ball-∅ (mm) 15 NRKB Ceramic 15.0 20 NRKB Ceramic 20.0 25 NRKB Ceramic 25.0 30 NRKB Ceramic 30.0 25 NRSB Steel 25.0 Reference SpheresReference Spheres (Type C) Search Order No. Ball Material Ball-∅ (mm) 15 NRKC Ceramic 15.0 20 NRKC Ceramic 20.0 25 NRKC Ceramic 25.0 25 NRSC Steel 25.0 30 NRKC Ceramic 30.0 Reference SpheresReference Spheres with magnetic base (Type D) Search Order No. Ball Material Ball-∅ (mm) 25 NRKD Ceramic 25.0 15 NRKD Ceramic 15.0 20 NRKD Ceramic 20.0 30 NRKD Ceramic 30.0 25 NRSD Steel 25.0 Reference SpheresReference Spheres with magnetic base (Type E) Search Order No. Ball Material Ball-∅ (mm) 30 NRKE Ceramic 30.0 20 NRKE Ceramic 20.0 15 NRKE Ceramic 15.0 25 NRKE Ceramic 25.0 25 NRSE Steel 25.0 Reference SpheresReference Spheres for spark machine (Type F) Search Order No. Ball Material Ball-∅ (mm) 245 NRKF TC 2 / 4 / 5 Reference SpheresReference Spheres with base plate (Type G) Search Order No. Ball Material Ball-∅ (mm) 20 NRKG Ceramic 20.0 30 NRKG Ceramic 30.0 25 NRKG Ceramic 25.0 50 NRKG Ceramic 50.0 25 NRSG Steel 25.0