This video shows how to easily figure out what those engraved lines mean on the foot plate of your Brother LX-3125 sewing machine. Also I show you how to change those lines on the fly if you need to use centimeters or you need to lenghthen your lines.
Roll of Tape
Sewing machine (I use the Brother LX-3125)
a pen or fine tip sharpee
C-thru ruler with measurements you need for sewing like centimeters or inches(or a regular ruler should also work)