Electronic Specialties' EZ-Tach +Plus Digital Tachometer, No. 328, is a wireless and inductive tachometer that gives easy RPM readings (from 0 RPM to 20,000 RPM) for setting idle speeds and tuning a variety of engines from string trimmers to automotive. Wireless RPM readings can be obtained by positioning the instrument near any spark plug wire, ignition coil or distributor; direct readings can be attained by using the included inductive clip.