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Ratech is a popular choice. I had one for a while and it always worked well, I had the base model, I believe $99. More expensive models are little more accurate, especially as the distance from the source increases, not a necessity for automotive applications.
I don't remember the heat range, but it was high enough to point at a header tube and determine if that cylinder was firing.
Another recommendation, don't let your 2 year old get it, he will chase the dog playing laser tag with his butt then put it in a super secret hiding spot, never to be found again.