Seems pretty decent. The temp gauge is not much it usually reads 80 degrees most of the time even if its 90 outside. The moisture side is pretty decent. I find that the bale needs about half hour to give the true number. When just out of the baler my rule of thumb is add 5 points. The pic shows 9.5 so it will be right around 15 percent. That hay was stacked on the wagon to be loaded in a tractor trailer a week or so later and was at 14 to 15 %. The bale needs time to sweat or start the curing process to get a real accurate read. Can't speak for other units but probing bales in the chamber will be lower % than an hour later on the wagon, But that being said an hour later or two days later the number is the same just as long as the hay was dry. That unit was a couple hundred bucks and simple to use. Been using it for three years now but have baled lots of small squares for years with out it also.

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I second the choice of the analog needle meter. The digital stuff looks impressive, but is maddening to actually try using.

The other thing we had was a sort of crochet-hook lookin' thing that I'd poke into a bale and pull. It was a great way to look for damp slugs in a bale. 

I'm looking for one that measure moisture and the temperature & I'll be using it on prairie hay too. I heard most of them are not as accurate on grass hay. Is an agra tronix HT-Pro a good unit?