Magnetic Base: (72-585-010-0). 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. IP54 X -Proof Indicator: (72-520-450-0) 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