The "KATT" Magneto Timing Tool is considered a must-have, easy to use tool to set your timing accurately. Also useful to test your magneto for 'ready to run' by simply connecting the tool any time, then turning the motor over. Well constructed from aluminum, and featuring long battery life. You'll love it! Made to exclusive Morris Magneto specs, this solid state unit detects induction, not "buzz box" continuity. Can be used for for testing other things, like starter relays or standard battery-coil ignition timing (with the power disconnected!).