I have been chasing a defect in my LS3 Corvette for days. I found the defective ignition coil within 10 minutes of receiving this tester. Easy to use, the color display is very clear and easy to read. The voltage waveform was the function I used to compare the coil outputs to determine the problem. In the past I've always fired cannon parts to find the bad part. This tool takes the guesswork out of troubleshooting. In my opinion a good tool and a reasonable price.
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