ISO 8503-4:2012规定了触针仪器，并描述了校准符合ISO 8503-1要求的ISO表面轮廓比较仪的程序。 它也适用于测定表面轮廓，范围在20μm到200μm之间，基本上是平面喷砂清理钢。可在喷砂清理表面的代表性截面上进行测定，如果无法直接观察表面，则可在表面的复制品上进行测定。

ISO 8503-4:2012 specifies the stylus instrument and describes the procedure for calibrating ISO surface profile comparators conforming to the requirements of ISO 8503-1. It is also applicable to the determination of the surface profile, within the range 20 μm to 200 μm, of essentially planar blast-cleaned steel. The determination can be carried out on a representative section of the blast-cleaned surface or, if direct observation of the surface is not feasible, on a replica of the surface.