A piano tuner is a skilled technician who adjusts the tension of the strings in a piano to ensure it produces the correct pitch. This process involves using a tuning fork or electronic tuner to measure the frequency of each note and make precise adjustments. Regular tuning is essential for maintaining the instrument's sound quality. In addition to tuning, piano tuners may also perform minor repairs and maintenance. They often work with various types of pianos, including grand pianos and upright pianos. Their expertise helps musicians achieve the best possible sound from their instruments.