This Mitutoyo vernier nib jaw caliper with fine adjustment has round measuring faces for accurate ID measurement. The fine adjustment allows the carriage to feed the slider finely. Inside and outside measurements can be directly read from the upper and lower slider graduations, respectively. This nib jaw fine adjustment caliper has a metric/metric dual scale. Range= 0-2000mm Minimum ID Measurement Dimension= 20mm Accuracy= +/-0.12mm Lower Scale Graduation= 0.02mm Upper Scale Graduation= 0.02mm Construction= Hardened stainless steel with easy-to-read satin-chromed scales. Weight= 10,200g