Detecting the magnetic field generated by a coil-on-plug (101) (aka coil-over-plug) using an adjustable probe (111). The probe (111) includes a signal detector (115) for detecting the field, a detachable adapter (117) configured to detachably attach to the housing (107) of the ignition coil at a specified...http://www.google.se/patents/US6940283?utm_source=gb-gplus-sharePatent US6940283 - Detecting field from different ignition coils using adjustable probe
