Peterson strobe tuners have taken over from Conn in the strobe tuning market and come in many different forms. I often use their tuning app on my iPhone for setting up guitars as the resolution on it is about 10 times better than most other tuners.

I need to get a better tuning pedal for my board. I've got the TC PolyTune 2 and TBH, its not very good. If you tune in the poly mode (strum all strings) you get a different result than if you tune in individual string mode. And if you try to just use individual strings, then it often slips into poly mode regardless, which isn't great if you've only got a few seconds between songs.