Rail systems require even tracks in good condition. This proves to be extremely important as they have to carry high speed trains passing every day. Those rails need to be measured and maintained. Rail welding must not result in any irregularities on the tracks and for that, special equipment has been developed. This equipment can connect to a regular smartphone via Bluetooth and display graphs of the measurements. Precision and accuracy are paramount in this app concept. Lines are thin and leave no space for interpretations, areas are coloured with gradients while still appearing light and clean.