The product includes four crayon cores and a special pen that can be connected to a computer. The pen allows for core replacement as needed, along with a card login system. It primarily measures the position of the tripod grip, the grip strength, and the handwriting pressure at the pen tip. By recording the minimum, maximum, and average grip force of the three fingers, the software can analyze the user’s pen grip. In addition, the tip pressure is recorded so that changes before and after training can be compared. The software can also connect to a camera to record the writing process in real time.