Review on Advanced Mapping Solutions with Southwire M400TP Professional Mapper by Patrick Ross

This device has serious problems that need to be solved! I've reverted to my basic/cheap 9 LED version because I can no longer rely on this device to work properly. If you haven't used the device for a while, it will turn on randomly and show the numbers #4 and #8 flashing on the screen (as mentioned by others). Removing the batteries (requires a screwdriver) and holding the "mode" button while reinserting them was the only way to fix this bug. Unfortunately during the opening I climbed onto the rafters of an industrial building and it took me almost 2 hours to get back on the ground trying to get it working. Never again!