Dual hole car spark plugs tester detector have two testing holes, you can test two spark plugss meanwhile and and if you suspect any spark plugs works improperly you could compare and test to make accurate judgment.
The Detector could tell the fine spark plugss from the bad by the strength of the spark.
Accurately test the spark plugs performance and ignition strength.
Application Range: 12.0V gasoline vehicles car spark plugss.
Plug and play, convenient and asy to use.
Item size: 140 * 77 * 38mm / 5.5 * 3.0 * 1.5in
Item weight: 335g / 11.8ounce
Package size: 170 * 130 * 60mm / 6.7 * 5.1 * 2.4in
Package weight: 380g / 13.4ounce
1 * spark plugs Tester
1 * Power Adapter