I wasn't sure which forum to ask this question so if this isn't the appropriate forum then moderators, please move. Anyways, I'm thinking of purchasing a pyrometer to help in analyzing and tuning my engine and I don't know much about them. What should I look for? What should I avoid? Are the cheaper ones ($20-$50) worth buying. I am not using this in a professional manner so pinpoint accuracy isn't necessary, just for reference. What are you using?