Fine adjustment. Base dimensions: 2" x 2-11/32" x 1-13/16". Also mounts test indicators with 1/4" post. 85 lb. pull. On-Off lever release magnet. V-base for placing on round surfaces. Travel: 1". Reading: .001". Continuous reading: 0-100. Tolerance markers. AGD Group 2, 2-1/4" dia. Lugback and carbide point. Robust, shockproof design. Rubber bellows on stem. O-ring seal on safety cap. O-ring protection for bezel and rotating dial. Sealed back plate