For this app you also need the SchüCal program on a desktop computer.

All the data is always to hand. Take measurements on the building site or calculate a unit at the customer in just a few steps. The SchüCal mobile app for measurements and latest information on the building site makes all the data available directly on site. Dimensions are changed directly in the mobile device. SchüCal is automatically updated in the office through the internet. Photographing the latest attachment situation and sending the photo to the office and production team via SchüCal is also easy with SchüCal mobile. In discussions with customers, items can be calculated quickly.

Quick start guide: http://www.schueco-service.de/QuickStartGuide_SchueCal_mobile.pdf