Usage Tips:1. Double 13mm Hole 2. 2A Power Supply 3. Technical Chip 4. 0-6000rpm/min 5. Enhanced Resistance Coil Our Spark Plug Tester pk others: 1. Double hole easy to compare the can work well 2. 2A power supply can make the spark larger than the 1A power supply(1A cause poor work or small ) 3. Technical chips work more stably to prevent spark plugs from failing to produce 4. Enhanced Resistance Coil make the spark brighter For JF109 Double Hole Spark plug tester support list: JF109 can support test spark plugs less than equal 13mm for Car/Motorcycles/Speedboats/Motorboats/Cropper etc. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC100-240V Colour:As Shown Material:ABS Package Contents: 1 * Spark Plug Tester Main Unit 1 * Power supply connector 2 * Gasket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.