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Hand held thermometers
Frank, you nailed the critical part of an infrared thermometer right on the head.
The difference between a cheapie and a decent one is not so much the accuracy, they're all pretty good nowadays, but the distance at which you can accurately measure, that's the important one.
I think you will find the spec. you're looking at on the Grainger site is not the distance, but the diameter at a certain distance. In the case of the MT4 you are looking at it is given as 1" at 8", so it will give you a measurement of an area 1" round at 8" away. Problem isn't that 8", but if you can't get closer than say 3', then the area would be a 3" circle it's measuring. If your talking about an engine block, that's not going to make a big difference, but if you want to check a single bearing on a driveshaft that might not cut it.
Best of luck.
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Hand held thermometers
We use them to check how well turf grass is doing, it's a really handy tool and super fast with excellent accuracy.
Ours are sort of 'middle of the road' units, about $1,000 a piece, but I also have a $10 unit that I use around the house & my own shop at home. I've checked it against the others, it's more than close enough for me.
I have a friend though in the insurance restoration industry that has a really nifty toy, errr, I mean tool. He has a hand-held thermal imaging camera, a FLiR unit basically.
It is so accurate he can point it at a wall and it will show wet areas from dry based on the difference in temperatures of the surfaces. They use it to check if there is still residual moisture that would develop into mould if left untreated.
Best of luck.
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How do you use it to check the grass?
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Healthy turf will be growing pretty vigorously and as part of that it transpires a lot of moisture, that has a cooling effect. It will also generally be drawing water up from the topsoil and be fairly thick and lush.
Less than healthy turf will show up as hotter spots, both during the day and well into the evening. In fact at sunset the temp. differential becomes very apparent since the healthy grass will cool off rapidly once out of full sun. Weak grass is thin, and allows sunlight to penetrate to the earth below and heat it up. This is a double whammy, the grass is weakened further by heating the roots, plus the sunshine on the earth speeds the evaporation of the water the grass needs.
Best of luck.
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