Product review (4 stars): Fits in between door & frame
This is perfect for my setup.  The outside of my dishwasher is not magnetic - it is covered by a wood like a cabinet door.  This indicator fits between the dishwasher door & the top of my dishwasher frame, where the controls are.  Just takes opening the door a crack to see if it is clean or dirty.  Of course sometimes I neglect to change the indicator, but for what I needed it for, it works just fine.