Interesting thread, only three weeks ago I discovered that my three Boss TU-2's didn't agree with one another. I had always wanted strobe tuner like Angus was using in the Let There be Rock movie. I did some Ebay research and they were way to expensive. I landed on a Peterson StrobeStomp. I have a microphone running over head so it picks up from whichever stack I am running out of. I had one of those clamp on ones and it turned out to be garbage. Since I don't gig anymore there is no need for me to have a tuner on every pedalboard and I can see the large readout very well from about twenty feet away. Since you question intonation and sounds like you care about it's accuracy: For adjusting intonation I place the guitar on two feather pillows so the neck is completely cantilevered and unaffected by any influence, tune the guitar then place a capo on the twelfth fret and make my adjustments. The feather pillows "hug" the guitar and keep in in place. I also bring the room to 75^f and ideally 50% humidity, most of us don't have humidity control so I live with what I get at 75^f. I'm with @ricksdisconnected too, lot's of tuner pedals I have never heard of but very cool thread.