Bests & Worsts Reviews from Amazon

I bought this because my 2003 Ford Expedition was hesitating around 40mph. Ford wanted to charge over 300$ to diagnose the problem. I figured I’d try to figure it out myself. So, using this I was able to identify a miss fire in cylinder 6. Found the plug to be in bad shape. Replaced all 8 spark plugs for around 30$. Saved myself over 500$ at least. If you have a car with problems this is a reasonable product to try. It worked for me and I’m just an average person. Also if you own a Ford I recommend looking up videos on YouTube by “Fordmakuloco” he has the best videos on repairing tough and easy jobs. One last thing, as far a durability goes, I accidentally left this in my pats pockets. It went through or washing machine (not dryer) and still worked after opening the case and letting it air dry. Tough little device for a Chinese made product.