The Avantgarde probe arm is magnetically attached and can be placed at any position, and the arm itself can be fine-tuned in three-dimensional direction for easy operation and accurate needle sticking, together with the adjustment of the sample seating position, it can satisfy the rapid sticking of the probe to any position of the sample; the probe arm adopts triple-coaxial cable and triple-coaxial connector, which has small leakage current within 100 fA, and the built-in cable in the arm avoids cluttered wire routing.