Some typical piano tuning instruments: From best to base: a tuning lever, a felt mute, a rubber mute, a felt temperament strip (still left), plus a Papps mute. Popular instruments for tuning pianos consist of the tuning lever or "hammer", a range of mutes, in addition to a tuning fork https://kitesurfingboardforsale14689.blogdeazar.com/31015451/the-2-minute-rule-for-piano-repair