英國 "Helix" T79012 圓規(鉛芯)
COMPASS-HELIX-T79012
The Helix T79012 110mm precision thumbwheel compass is a great value compass ideal for school pupils. Thumbwheel provides enhanced accuracy and precision. Geared head for centring. Double knee joints are ideal for perfect small circles. Kit contains 2mm replacement leads and additional screws and nuts.
