Fowler Dial Indicator & Mag Base Set Dial Indicator Features include... 0-1" Travel 0.001" Graduations 0-100 Readings 2.25" Diameter Black Face Revolution Counter Tolerance Indicators Magnetic Base Features include... 2" x 2-11/32" x 1-13/16" Mag Base Size 85 lb Magnetic Pull With Fine Adjustment On - Off Lever to release magnet V-Base for placing on round surfaces