My eyes are getting worse each year, so the bigger display is great. But even better, since I play in standard tuning, is that there are no buttons to accidentally calibrate it to another tuning.

http://whirlwindusa.com/catalog/black-b ... atic-tuner

NOTHING makes me feel like more of a dumbass than when I fat foot/finger my TU-2 and take it out of the mode I am used to. Usually seems to take a ridiculous amount of time and an ungodly sequence of events to get it back to 'normal'.

This is the best one I've found: http://www.turbo-tuner.com/
Very accurate, fast response, and the buttons for switching modes are small enough that you probably won't accidentally step on them.