I know these have been around for quite a while but recently the prices have dropped to the point they are affordable,like a 100 bux. I don' have one yet but there's one in my future. It appears to me that with this, you can not only tell if an engine is running hot or cold but by aiming it at individual cylinders or spark plugs tell if that cylinder is firing or not. <br /><br />Do any of ya'll have one or maybe tried one? I'd be interested in hearing what ya'll think.<br /><br />c/6<br /><br />Hooty