I would be willing to bet that the ones from harbor freight are probably just as accurate as the ones that most people use by durtrax, ofna, the PE-1, and such as that. That's not saying they're accurate, just on plane with the rest of the field. I think the only way that you're going to get something more accurate is to spend a hundred bucks or more on an industrial temp gun that's certified to be accurate within a certain range. I bought a $180 temp gun used for $60 and I haven't had any reason to doubt its accuracy. If I would have known harbor freight had them before I ordered mine, I would have gone and got it just to use until the good one got here. Of course I discovered they had them the week AFTER I broke my truck in, isn't that just the way.