Dimensional Measurement Gauges, Fast Response Speed Flexible Digital Readout Gauges for Digital Readout Linear Scale for Parts Processing: Amazon.com: Industrial & Scientific
MARPOSS manual gauges for external diameter measurements
Internal Gauges
Mahr Dimensionair Air Gage Dial type | Willrich Precision Instruments
Amazon.com: Stainless Steel Pipe Welding Dimensional Measurement Thickness Gauges Gauge Welding Inspection Tool Inch and Metric with Case : Industrial & Scientific