If your main interest is measuring chokes you may want to look at MSC for a gage which measures inside diameters from .375- 1.375". The gage is capable of measuring the last three inches of choke, is very accurate, and will accurately indicate how the choke is formed. It has a face similar to a dial indicator with 2 arms, 1 stationary and 1 which pivots. The gage is made in China and have had mine for nearly 2 decades and also use it for lathe work. I paid $75 through Enco at the time which became part of MSC recently.
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