HHIP Universal Single Indicator Concentricity Checker. Diameter capacity is 0.157-0.980" or 4-25 mm. Length capacity is 4". Accuracy is 0.00012"/ 0.003mm. Dimensions are 216 (length) X 114 (width) X 130mm (height). Concentricity Gauge allows you to measure the runout of parts internal and external. Two position wheels made from solid steel. Precision drive wheel has a perfect ratio to push the parts down. Ultra high precision ball bearings provide friction free movement. Directional drive hand wheel pushes the parts into the stop for accurate repeatable readings with equal pressure. Heavy duty base mounted fine adjustable sliding test indicator holder that will accept test indicators with dovetail slot. Adjustable mechanical arm stop holds the arm up for one handed operation. 4 & 10mm diameter master setting pins are included.