Oldbones Spark Plug Gap Tool With Feeler Gauge,Universal Spark Plug Gapper Adjuster Compatible with Most 10mm 12mm 14mm 16mm

How to use

1.Use a clean cloth to wipe the surface of the feeler, not the case the feeler is stained with oil or metal powder, otherwise it will affect the accuracy of the measurement results.

2.Insert the ruler into the gap, pull the feeler back and forth, feel a little resistance, that the gap is close to the value marked on the ruler; if the resistance is too large or too small when pulling, it means that the gap value is less than or greater than the value marked on the ruler, that is the measured gap values

3.When gap measurement and adjustment, firstly select the gap in line with the provisions of the plug feeler inserted into the measured gap, and then adjust, while pulling the plug feeler, until feel of a slight resistance to tighten the locking nut, at this time, the value marked out by the plug feeler that is the value of the measured gap.