The Elcometer 123 Surface Profile Gauge is an easy to use analogue gauge.The Elcometer 123 Profile Gauge measures the peak-to-valley height of a blast cleaned surface in a similar way to the Elcometer 224 Digital Surface Profile Gauge.Range 0 - 1000μm (0 - 40mils)Scale 2μm (0.1mil)Dimensions 105 x 55 x 25mm (4.1 x 2.2 x 1”)Weight 335g (12oz)