Not trying to be dum, but I'm not sure!
I just got it and I'm still "playing" with it. Off to the race track this weekend to compare readings with what the other guys are using.
Raytek, Raynger ST (not certified above 300 celsius). Point and shoot, -25 to 950 Deg F. I bought for taking ROOM Temperatures for my work, not my "race car".
