superaccurate       
adjective (also super-accurate) uk/ˌsuː.pərˈæk.jə.rət/ us/ˌsuː.pɚˈæk.jɚ.ət/
 极为精确的,超精确的
extremely accurate
  An understanding of the magnetic properties of atoms led to the development of superaccurate atomic clocks. 对原子磁性的理解引发了超精确原子钟的发展。 
 Many smartphones now have super-accurate GPS. 
 - More examples
 - This instrument provides superaccurate readings, even at very low temperatures.
 - Microsurgery requires superaccurate adjustment of optical and electronic equipment.
 - The plane's instruments make superaccurate navigation possible.
 - The tests for the disease are known to be superaccurate.
 - The regulations state that all the thermometers have to be compared to a superaccurate thermometer.