Either of those IR thermometers will work just fine, anything you do with them as an inspector won’t need to be extremely accurate anyway.
I love harbor freight. Took apart an 80 year old cast iron passive boiler using tools from there. Got a 3’ steel pipe wrench for $19.00, it was a life and back saver. I’ve also had a brad nailer from there which I have built much of the furniture in my house with over the last 13 years. But as much as I love HF, I wouldn’t buy tools which I planned on using every day. They wouldn’t hold up long enough to be worth the savings.