AGD Group 4 Dial Indicator has the following specifications. Starrett 656 Dial Indicators have a shockless, hardened steel gear train and jewel bearings.
Features include a lug-on-center back. Balanced and tapered hands are easy to follow. Rugged and simple unit construction with a universally fitting? Sharp bezel serrations for positive grip. No-glare satin finish on case.
Hardened stainless steel rack and spindle. Massive bridge for rigid bearing support.
Hardened stainless steel gears and pinions. Non-reflecting white eggshell finish on dial. Lug On Center Back Installed, Flat Back Included.