noun, na-adjective, noun which may take the genitive case particle 'no'
absolutely accurate; unmatched precision
Emphatic compound meaning accuracy that is peerless or flawless. Often used in formal or technical descriptions.
His shooting is absolutely accurate.
This machine provides measurements of unmatched precision.
正確 means 'accurate' or 'precise' in a general sense. 正確無比 adds the element of being peerless or incomparable, making it a stronger, more emphatic expression.
Compound of 正確 (accurate) and 無比 (unparalleled, peerless). The combination creates an emphatic term for flawless accuracy.