This Upright Comparator Tool has been designed to work with the Derraco Comparator Kit (sold separately) inserts to allow you to measure your brass cases, or complete rounds, in an easy method rather than the traditional 2-handed method with a set of callipers, which can be tricky for longer cases, or those with grip issues. 
The Upright Comparator Tool has been designed around our digital gauge (sold separately) to accurately measure your cases, complete rounds, or even just a bullet’s ogive length, to an accuracy of 0.001”.
The unique adjustable “V-plate” on the base allows you to perfectly line up your cases for ultimate concentricity.
The kit comes with a standard height adapter for the comparator kit inserts, but an “XL” adapter is also available (sold separately) should you wish to try this.
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