Here we have 2 cylinder gauges and one smaller dial indicator. The Ames looks to be for larger bores. With the extension rod its approx 5 1/2. You can unscrew the extension and get it down to approx 2". The starret looks to be setup for smaller bores. Like in the 2" range. I believe the Ames is called the Ames JR. cylinder Guage. The starret is a 452b cylinder Guage. The other starret is a smaller button style dial indicator. Model no. 196b. All three for one ????. They all zero out and seem to be in good condition.
