Lisle 29500 Checks Both Low Voltage and Spark Plug Wires. The low-side checks AC and DC curr

Checks Both Low Voltage and Spark Plug Wires. The low-side checks AC and DC current up to 28 volts with power on. The high-side checks spark plug wires without piercing. Complete with insulated clip. 26970 High End Bulb 26270 Low End Bulb.