The Automotive Diagnostics and Publishing Zapper Automotive Ignition Coil Pulser and Tester, designedto activate and pulse all kinds of ignition coils on a bench, allows users to test all available coils found on the market today, according to the company. The Zapper also allows Coil On Plug (COP) testing, DIS, Distributor Coils, Coil Packs and any other coil system. It also allows testing of COP coils with internal driver within the coil.