Neoteck Coaxial Centering Indicator 0-0.15''/0.0005'' Digita Indicator Set with Storage Case Accurate Co-Ax Indicator for Milling Machine Center Test Dial: Amazon.com: Industrial & Scientific
CO-AX COAXIAL TEST CENTERING INDICATOR
34515 Centering Dial Indicator - Hare & Forbes Machineryhouse
iGaging Coaxial Centering Test Dial Indicator Complete Set - 400-C02-I - Penn Tool Co., Inc