|I take a piece of stiff cardboard (or the cardboard that bias tape comes wrapped around) and use that to make my own measurer. I will cut notches where ever I want and not have to worry about remembering "are button holes 2-7/8" apart or 2-5/8 apart". I just use my handi dandy home made measurer. I do this for anything that is small and needs repetitive measuring. I must say I do this because of two reasons 1) I always misplace my measuring tools 2) I forget little measurements between blinking my eyes if I don't write them down. So, this takes the place. Actually it doesn't matter what the actual measurement is as long as you use what ever measurement you've cut into the faux measurerer consistently throughtout the garment.
I have used this for spacing curtain pleats, skirt pleats, buttons, buttonholes, trim, and any other thing I need multiple placings for!