WVMA1001 Features: * Analyzer * Engine Ignition quickly and safely * Eliminate guesswork as 1 of 3 LED * Will accurately indicate the condition of ignition system * Just clip on any sparkplug wire and crank * Simple and reliable for home, shop or professional use * Test for proper voltage: high, low or no voltage * Quickly and safely tests for proper spark on 2 stroke and 4 stroke engines Dimensions: * Dimensions: 1.5"" H x 4.5"" W x 10.25"" D