I use either Yellow Tape measures or Bright/Neon green Tape measures so that I can spot them.
I paint my speed squares and often used measuring devices either white, yellow or neon green, neon yellow or neon orange. I got tired off not being able to spot my measuring devices, and that helps me spot them when they are under, beside or behind other objects.
I tried fluorescent/neon pink once (on LOML's recommendation) and decided that wasn't for me.
Red gets lost if it is in a shadow and I stay away from silver and black also. Man can they hide with those colors when in a shadow.