Compact Dual-Hole Spark Plug Tester for Car Ignition Plug Analysis and Diagnostics - 12V

Product Usage: 1. Insert spark plug into detector hole 1 or 2; If you want to compare the old and new spark plugs, insert the new spark plug into hole 1 and the old spark plug into hole 2. Connect it to the power supply. 3. Turn the ignition key 4 clockwise to turn on the detector, indicator 3 will light up, and the detector is now running at 1000 RPM. 4. Turn the key switch 4 clockwise again to adjust the working frequency between 1000 RPM and 6000 RPM. The higher the frequency, the stronger the spark. Note: This link is for 110 V/220 V US plug power supply, if you need to purchase 110 V/220 V European plug, please pay attention to the European plug shipping information when placing an order or contact the seller to purchase. thank you.   🔸 Features : 1. [Dual Hole test and time saving]: The Automotive Spark Plug tester is capable of simultaneously testing two holes and simulating engine operation, which is more efficient and time saving. 2. [working frequency 0 ~ 6000 RPM] : Automot