|If you have a box of machine needles you can't identify, pick up a jewler's loop or loupe. Make sure it is at least 10x magnification, some models also have lighting included in the loop. They run between $5.00 to $10.00 unless you want the 14K gold one for $200.00
It makes reading the sides of the needles easy, even with reading glasses. You can also zoom into the tip of the needle to identify the tip type.