Just download tunings for your 6 strings on your guitar as mp3's to play on your computer or phone to tune against. Get mp's of E, A, D, G, B and high E and your set. There has to be hundreds of places on the web to get these for free.
I'm sure I have hundreds on my computer Every course from TrueFire has them. (I know. shouldn't mention that here!) Every issue of Guitar Techniques magazine has them on the included CD. There has to be some on YT that you can download.
[u]Guitars:[/u] 2014 PRS Santana, 2013 PRS Paul's, 2009 PRS Hollowbody, 1972 Gibson ES-325, 2012 Fender Strat American Standard, 2012 Yamaha Pacifica, Martin M-36, Martin 000-15M, Seagull S6 Classic[br][u]Amps:[/u] Fender Blues Junior III, Boss Eband JS-10, Line 6 POD 500X, Quilter Microblock 45