Reference chart for your radius gauge
The Ing Engineering gauge is typical for longtrack blades only because it reads only down to a 16m rocker whereas the Marchese gauge can be used for long track and short track blades as well. The Marchese tool reads up to a 5m rocker on the same scale, but is a little less accurate than the Ing gauge. You'll be able to tell the radius on an Ing Engineering gauge with a tolerance of about +/- 0.5m on the Marchese this is +/- 0.8m as an indication. However, its more difficult to read the Mahr clock of the Ing gauge than the Marchese clock. The Marchese clock has a 360° degree scale which makes reading the radius more easy and secure (the pointer is less nervous when you slide the gauge along the blade).