Acuity Ring

 is an accessory in. It increases the wearer's Hit Rate by 10 and can be obtained in the Arris Dome behind a Sealed Door. Also, Ayla can charm it from a Giga Mutant. It can be worn by any character.

Name Origin
Acuity is a word for keenness of perception, commonly used for visual perception. Seeing better undoubtedly increases a character's ability to hit a target.