Here is my version of BDZ scouter. It's not exactly perfect copy but it's actually working device. Inspired by google virtual glasses I made virtual distance sensor.
I used Ardino Nano, OLED scree and Laser distance sensor (exact model in the schematic). Laser sensor takes readings (not calibrated yet) and display number on OLED screen. Perspex mirror reflects the image (45 degrees) to the the lens (used from cheap google cardboard virtual glasses) and then it's projected on clear perspex screen.
So you will still see everything but in the clear perspex you will also see distance to the object you looking at. On OLED screen i typed 'Power' instead distance because that's what this device suppose to measure in DBZ :D
To place it on my head I used 15mm wide plastic headband which seem to work fine.
It's still work in progress, but I'm so happy that it works that i decided to share prototype now :)