Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity 744587373897 They eliminate radio frequency interference

Calterm 66331 Tru-Spark Ignition Firing LED Indicator, Adjustable Sensitivity 744587373897 They eliminate radio frequency interferenceBrand Calterm Model 66331 SENSITIVITY ADJUSTMENT DIAL is a Calterm EXCLUSIVE feature that allows isolation of a specific plug wire and eliminates false signals from wires routed in close proximity. Green LED indicates that the tester and batteries are operating properly. Red LED flashes each time voltage is released from the coil through the spark plug wire. Rugged high impact ABS housing resists oil and endures shop conditions. Works with DIS and

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