The biggest and perhaps most important difference is the size of the baseplate by making it significantly smaller it fits better in the userrsquos hand it also has a smaller capsule same as the race thumb series which significantly reduces the risk of bubbles another difference is with the stencil holes they are withdrawn from the baseplate and put in a separate ldquoscale and stencil holerdquo plastic card that comes together with the compass everything to keep the compass as cle