Dial indicator for precise measurement with magnetic base 0-0.4in range1、Maximum Pull: Strong 2 magnet surfaces with ON/OFF control provides 176lbs (80kg) maximum Pull. Please note that a metal countertop/surface with a thickness of 30mm and above is required to achieve this maximum pull. 2、Fine Adjustment Knob: With fine adjustment knob for preciser positioning. Lug back included (hole size 1/4in, 6.3mm). 3、Full 360° Rotation: The bezel combined with the outer dial can rotate a full 360°, allowing you to set zero in any position. 4、Easy Reading: The continuous scale is easily marked for effortless reading. The bezel clamp stabilizes the reading and the improved crystal face further simplifies the reading process. 5、Measuring Range: Dial gauge with measuring range 0‑10mm / 0‑0.4in, scale 0.01mm (0.004in), high precision and easy to use.