6" range and .50" fine adjustmentDisplayModels Title Range PM-24 Pin Gage Master 24 - 30" / 600 to 750mm PM-30 Pin Gage Master 30 - 36" / 750 to 900mm PM-6 Pin Gage Master 6 - 12" / 150 to 300mm PM-12 Pin Gage Master 12 - 18" / 300 to 450mm PM-18 Pin Gage Master 18 - 24" / 450 to 600mm