Thread: Tuner
I also like to use strobe tuners. I have an older (now discontinued) model from Sonic Research (the ST 122), purchased many years ago. Now they only make it as a stomp box (ST-300). I ended up with both and they are both really fantastic.
Additionally, I have two apps for my phone:
iStroboSoft by Peterson - a really great strobe tuner app, has all sorts of features
insTuner from EUMlab - another good one
All the best