Somewhere I have 3 tuning forks, one pitched at A, one at E and I can't remember what the other one is. I think E saw the most use as I was playing guitar. Then there was my old set of pitch pipes. They've long gone because I haven't seen them for well over 20 years! I rather liked my pitch pipes. I was better at playing the pitch pipes than I was playing any plucked instrument that's for sure.