As soon as these came, one of them immediately went into my personal knitting box!
This beautifully made measuring tape by Kinki Amibari has a magnet on the back, and a removable lanyard so you can keep it stowed where you want it and have it within reach. As an added bonus, you could use the magnet for holding stitch markers while your adding them in on your set up rows.
This one comes in black, with ecru/cream.
Measures inches and centimetres.