After trying several ways to come up with the easiest way to measure my fish while on the water I finally decided to go out and buy a sticker. Not wanting to under measure a fish I decided to take one extra simple step.
Step 1
Stick sticker on paddle, place the sticker on the side that DOES NOT have the paddle release button
Step 2
Place a ring of Goop around the entire paddle right around the 1/2" mark. Slide the paddle drip ring over, as you're sliding it over keep turning the drip ring so that it will evenly distribute the Goop.
Final product
I placed the ring about 1/2" over to avoid under measuring