I've been wanting one of these for the longest time. I've been using my Eleven Rack and a Boss TU-80 tuner to set intonation on guitars and they're pretty accurate. I've never been able to justify a new Peterson mechanical strobe tuner, but last night I found this one on my local FB marketplace and wasted no time in making the deal. For a vintage (mid 70's) piece of electronic gear, I was amazed to find that it is accurate within less than 1 cent on tuning!