If something is superaccurate, it is exactly right and has no mistakes.
Being superaccurate is very good and important, especially for things like measurements or information.
Examples:
The clock is superaccurate and always shows the right time.
Her aim is superaccurate, and she never misses the target.
The map is superaccurate and shows all the roads perfectly.
My drawing of a cat is superaccurate, it looks just like a real cat!
His memory is superaccurate, he can remember everything perfectly.
The robot's movements are superaccurate, it can do things exactly right every time.