I've come to the conclusion that the Peterson is the only one that stands up to direct sunlight. It is a bit large but, in its favor, it does include a DI. But for the sunlight issue, I LOVE my Sonic Research Turbo Tuner (accurate to .02 cents!). Seeing as I am currently assembling some new pedals, I think I'll wait until I have everything together and can lay out a potential board to judge 1. which size and shape Temple Audio board to get, and then 2. how much room I'll have for the tuner. If it fits, I'll go with the Peterson. If it's too crowded, I'll stick with the Sonic Research and try to remember to bring along a clip or my VS-II for outdoor gigs.
Bill