"most accurate possible" is correct and can be used in written English.
It can be used when comparing alternatives or describing something as being as accurate as possible. For example, "We want to use the most accurate possible method to measure how much rain fell."
Current efforts in observational cosmology focus on measuring the most accurate possible values of Hubble's constant and of critical density.
The lighting, Ms. Dorram said, provides "the most accurate possible read on hair color and how it relates to skin tone".
The goal is to make what we hope is the most accurate possible forecast given the information available at that time.
A pollster working within a campaign may face a variety of perverse incentives that compete with his ability to produce the most accurate possible results to his candidate.
The watch reportedly calculates 25 trillion "ratio combinations" to arrive at the most accurate possible system for measuring the movement of the stars.
Two esteemed astronomers, Jean-Baptiste-Joseph Delambre and Pierre-François-André Méchain, were enlisted to make the most accurate possible measurement of a significant portion of a quarter meridian, so that the full length could be extrapolated, then minutely partitioned.
He urged the scientists of the next generation, or the next-but-one, to make sure that as many of them saw it from as many parts of the world as possible, and made the most accurate observations possible, and then combined their results.
It is recommended that you mail your test vials within a day, if possible, so that the lab can get the most accurate results possible.
This information is essential in providing the most accurate warnings possible.
"My only interest at this point is to reconstruct and hand down the most accurate material possible," Mr. Eng said.
Elizabeth Carll, a trauma therapist in Huntington, L.I., suggests that parents give children the most accurate information possible to the degree they can understand.
