• Semi-transparent layer of rhodium, which is fused into the polished surface of the counting areas
• Light transmission is controlled between 29 and 32%
• Cover glasses, which are supported by four small, matte surfaces opposite the rulings
• Slide, which is provided with chamber charging inclines and with polished concavity beneath the ruling
• Condenser and iris diaphragm adjustment, which are less critical
• Rulings, which are clearly visible within a wide range of illumination; with polished concavity beneath the rulings
