| 摘要 |
An accessory for a fuel burning or processing engine or machine is provided. The accessory comprises a core formed of a material having ferri-magnetic properties. The core is of elongate form and defines a recess adapted to receive a high tension lead. The accessory further comprises a clamping device for clamping the high tension lead and retain it in the recess. The core is retained within a housing formed of a non-ferrous material. The housing is provided with a device for receiving calibrating elements formed of a material with high magnetic permeability at low field strength and low hysteresis loss.
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