The orthopedic depth gauge by gSource is a precision instrument designed specifically for orthopedic use. With a measuring capacity of 100 mm, this depth gauge is essential for accurately determining the depth of bone structures during surgical procedures. The high-quality construction and brand reputation of gSource ensure its reliability and precision for orthopedic applications. Selling for a friend according to them, they bought it for school and it is made by gSource. Feel free to ask questions. Thank you.