This Upright Comparator Tool has been designed to work with the Derraco Comparator Kit (not included - 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 (not included - 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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