The PMR01TJ0303A50 is a type of potentiometer manufactured by Royal Ohm. This component is a 3 terminal, single-turn trimmer with a maximum resistance of 3kOhms. It features a plastic case with a round shaft, and is commonly used for adjusting audio levels, resonant frequencies in radio circuits, and setting mechanical limits. It has a 6mm diameter shaft, and a temperature rating of -55°C to +125°C.