Measure the note (the A above middle C) with a simple phone tuning app. Free Iphone tuning apps include Panotuner and Tracetuner. Android apps include Datuner Lite and Gstrings If the note is close to A440 (meaning the dial is close to the A) the piano probably only needs a standard tuning. If the note is 20% or 20 cents or more away from the note (around 1/4 of the way towards another note) then the piano will probably need a pitch adjustment. If the tuning app shows an entirely different note (other than A) then the piano is extremely out of tune. In this case your piano will need to be evaluated by our technician.