I have a moisture meter/metre on the list of tools that I might like to buy at some point in the future so I have kept note of some reviews as I have come across them. My personal preference would be for a pinless meter, so I have mainly kept track of reviews of this type of meter only. Unfortunately, these also happen to be the more expensive type.
Wagner MMC220 :
* There is a review of the Wagner MMC220 pinless meter
here, which basically says it is a good quality product.
* It is available from Amazon
here for US$290 (plus shipping). I think this one is available from Amazon for delivery to Europe (but they will probably "pre-charge" you VAT when you buy the product, so you'll have to factor an extra 21% plus into the cost - always something you have to do anyway when importing from outside the EU but at least sometimes there is the chance that something may not be billed for but not in this case by the looks of it). The Amazon link includes some user reviews.
* There is a discussion of this meter on an Australian forum
here which might be of interest as it also refers to some other products (in addition to baulking at the price of the Wagner!).
Wagner MMC210 :
* Summary review from Taunton is
here.
* Available from LeeValley for US$290
here.
Wagner MMC205 :
* Summary review from Taunton is
here.
* Available from Amazon for US$170
here. I haven't checked, but I would imagine the same rules apply for VAT, etc., as for the MMC220.
Those are not necessarily the best sources, or prices, for those particular meters, they just happen to be some links that I have to hand. There is a wider selection of moisture meters listed/reviewed by Taunton
here (just enter "moisture" in the search box and it will throw back a list) - these are American-centric but I would expect quite a few of them to be widely available online.
I think that I have seen some people on here refer to having one of the Wagner meters in the past so there are likely to be references to one or more models available via the forum search facility.