Scalex Plan Wheel "Scalex Plan Measurer Roller Digital Take Off Tool"
you want to measure plans the fast, accurate way, then the Scalex
PlanWheel XLU 2 is it. Here's the perfect tool for taking scaled
measurements from blueprints, maps, and plans. Just select the built-in
scale factor to match the plan and roll the PlanWheel. The measurement
is displayed instantly. The PlanWheel is portable and uses two AAA
batteries (included). The PlanWheel connect to your computer with
optional Interface Kit sold separately but is not required to use the
PlanWheel XLU 2.