i am assuming that you are talking about cross referencing the VDI numbers to either another model or make of detector or simply looking to see which vdi's corrospond to which target. If you are looking for the former than you will need to tell us what make/model detector you want to corrolate VDI's to.For the latter, the chart posted on the meter seems to be pretty close to accurately id'ing the various coinage out there. You may,however, find slight vdi discrepancies depending on your soil condtions and each machines build variables.