A moisture meter is going to be one of the most common tools that you use as a home inspector. Spend the extra money on something that is going to be reliable and not break easy. I am not too impressed with the Extech tools for this reason. I use a Protimeter Survey Master and it has been invaluable. It has both invassive and non-invassive measurement modes along with the ability to add remote probes. They are a little more expensive, but well worth the extra money. After breaking a couple of cheaper units, I realized it was worth it to just bite the bullet and buy a better model.
I have been shopping for a Surveymaster, but there seems to be a few different models such as 5360($475), 5360L($395), 8160($439). I dont want to short myself with the wrong model. Anyone know the differences?