active speedo sensor for the most of the KOSO speedos - doesn't need magnetos, detects f.e. the head of brake disc bolts - available in several configurations:
with KOSO standard connector (black case): length of 900mm, 1350mm and 2000mm
with waterproof Koso connector (white case): length of 900mm, 1350mm and 2000mm
Please note: please check the connector type of your Koso meter before!