Trackside3D NEM-362 magnetic coupling testing tool. This tool is intended to be used with a 1/8" cubed neodymium magnet (~ 3.175mm) to create a reference polarity for building magnetic couplings. The tool can be inserted into code 100 track to check NEM 362 pocket height, polarity and test functionality of your newly printed NEM magnetic couplings.
For non-polarity couplings, simply insert the cubed magnet so that both the North and South poles are facing outwards (eg. turned sideways). For polarity couplings, simply insert the cubed magnet so that either the north or south coupling is facing out.
By using this as a reference tool, you can make sure all your magnets are the correct polarity. For non-polarity magnets, this helps make sure you've made all the magnetic couplings the same way (eg. North-South or South-North).