Digital map measures, blueprint plan measures, distance measuring tools, curve measures, inch counters. Featuring Scalex MapWheels and PlanWheels; Calculated Industries Scale Master, Scale Master Pro XE digital plan measures. Available with optional Windows computer interface. No more time-consuming, confusing manual measurements! Alvin map measures and plan measures. Designed for building, engineering and construction professionals. Obtain fast, accurate linear, area and volume take-offs from blueprints, drawings and maps. Ideal tools for preparing bids and estimates in the field or office.