RIDGID Sketch is a handy tool that allows you to calculate and communicate various measurements on your projects. It can be used on its own or in conjunction with a RIDGID LM-400 Laser Distance Meter. The app will connect to your LM-400 via Bluetooth and receive precise distance measurements from the device. RIDGID Sketch works in both drawing mode and photo overlay mode allowing you to develop precise room plans or annotate measurements within a picture.