This product is a sensor for extracting a timing signal from the current change of an ignition coil or coil type injection based on a current transformer. Piezoelectric type injection can also be detected, but the output is several tens of mV because the current is minute.

At engine rotation measurement, even models without a secondary side high tension cable can be detected.

Since it is a small, clamp type, it can be clamped to an existing harness cable.