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Easy to use and a must have for any serious shop. This comes with a built-in selector switch to chose from 0-5,000 RPM low scale, or 0-15,000 RPM high scale. The RPM readout is accurate to within + or - 2%. Zener voltage regulator uses 9 volt battery (Not Included). This unit comes with a built-in battery check too. Works on all 2 cycle and 4 cycle single cylinder engines. Super easy operation as no direct connection required. You simply hold built in antenna near spark plug. |