There are several accessories and tools that can be useful for incubating eggs and maintaining optimal conditions for embryo development. Here are some of the most common incubator accessories:

1. Thermometer and hygrometer: These tools are used to measure temperature and humidity levels inside the incubator to ensure that they are within the appropriate range for egg incubation.
2. Egg turner: An egg turner is a device that automatically turns the eggs several times a day to prevent the embryos from sticking to the inside of the shell and to promote even heat distribution.
3. Candling light: A candling light is a bright, handheld light source that can be used to check the fertility and development of the embryos inside the eggs. Candling is usually done after 7-10 days of incubation.
4. Incubation trays: These trays are specifically designed to hold the eggs in the incubator and can come in various sizes to accommodate different egg types and sizes.
5. Water reservoir: A water reservoir or humidifier can be used to maintain the appropriate humidity levels inside the incubator, which is critical for successful embryo development.
6. Incubator cleaning supplies: It is important to keep the incubator clean and free of bacteria to prevent contamination and ensure optimal hatching conditions. Cleaning supplies such as disinfectants and egg wash solutions can be helpful.
7. Hatchling supplies: Once the eggs hatch, the chicks will need a brooder box, heat lamp, and water and feed containers to keep them warm and nourished.

These accessories can make the incubation process more efficient, effective, and convenient. It is important to choose high-quality accessories that are compatible with your specific incubator model and egg type for optimal results.