Work Until...Measuring Tape

From Twice Sheared Sheep:

Your pattern tells you to work until the piece measures 3″ long…
Do you find yourself pulling out that measuring tape every row praying that it is finally long enough?
Behold! The Work Until… Measuring Tape!
    •    Replace any regular stitch marker on your needles
    •    Set the slider to the measurement you need
    •    Knit until you reach your measurement!
    •    The ruler’s already on your needles
Measures up to 12.5″ / 32cm (from the cross on the stitch marker until the end of the tape)?Fits up to a US 10.5 (6.5mm)