Manual incubator holds approximately 1200 chicken eggs

Manual incubator holds approximately 1200 chicken eggs. I bought it four months ago from Al-Zaydiyah store in Riyadh, almost new, used only once, hatching success rate is about 90 percent. But I canceled the project because the worker I have is unreliable, and I previously sold another automatic one; also offering an automatic incubator with 500-egg capacity