Some frequent piano tuning tools: From top to bottom: a tuning lever, a felt mute, a rubber mute, a felt temperament strip (remaining), plus a Papps mute. Prevalent resources for tuning pianos consist of the tuning lever or "hammer", many different mutes, along with a tuning fork or electronic tuning https://animesexdoll43210.bloggactif.com/31817522/the-greatest-guide-to-piano-tuning