Moisture meters which to buy?

Getting a moisture meter is long over due on my list that is thankfully coming to a close, so as I know very little about them I do know that prefer the pin less type. I had a look at Carba tec and they range from $77-500. Ebay from $10 -30 except for one that was $700 but they all claim to. Have the same level of accuracy. So which meter is the one to go for? How much should I pay for one.
im only interested in measuring the moisture in wood nothing else