Reticle for Tool Scopes. The eyepiece contains one reticle designated by the user. Note that the reading of a specimen varies depending on a magnification of the objective lens used. The dimension of reticle is 19 mm in diameter and 1 mm in thickness. 0.1 mm divided by magnification of objective is reading. Tool Scope is the registered trademark of Chuo Precision Industrial Co.,Ltd. in Japan.