PROBE MASTER 3900 Series rugged, heavy duty oscilloscope probe provides a snap-on rotating ground lead and a heavy duty fixed tip. The switchable model allows for quick finger tip change between 1X, 10X and reference ground. Unit’s body is made of high impact ABS, while soft molded strain reliefs at stress points assure long cable life. Product provides high performance coupled with high quality at a low cost. Accessories include sprung hook, 6″ ground lead and trimmer tool.