RPT means "Registered Piano Technicians". This is the highest title, or designation, given by the PTG - Piano Technicians Guild. PTG is recognized world-wide as the ultimate teaching and testing body for the field of piano technology. Many years of preparation, rigorous testing procedures and a demanding Code of Ethics characterize the term "RPT".
Click image below for full details about Registered Piano Technicians (RPT) on the PTG Website, and also to locate an RPT anywhere in the USA, Canada, Hawaii, or world-wide: