Review on Lisle 20700 Coil-on Plug Spark Tester: Enhance Spark Plugs Diagnostics with Ultimate Precision by Fred Griffin

I liked the speed of delivery but the manufacturer. could not report screw plate adjustment via "voltage output through coil from my car". Assuming they are all different but have a high output voltage, it is extremely important to know if you have a weak coil across the connector, adjusting the set screw will show if it is weak, faulty or working as expected. There should be a "Website Setup Guide" by Lisle < Mfg. so Joe can fix the problem and set the predefined voltage value for his car. I have a Chevy Colorado 04'/5 cylinder. It's still in the package until I get the right information