Model: 
530-312 (0 to 6"/ 150mm) 

-Metric/Inch dual scale
-Lower Scale Graduation of 0.02mm, 
-Upper Scale Graduation of .001"
-accuracy of +/- 0.03mm.
-High Accuracy model. Features a small face angle of 14 degrees which provides easy reading.
-Measures Outside Diameter, Inside Diameter, depth and steps.
-Furnished in Satin Stainless Steel with easy reading graduations.
-Equipped with a lock screw for holding the sliding jaw position allowing the user to get easy measurements.