hmmm, i dont have much experience with these except for the super expensive industrial kind that we use here at work that are in the 100k range. unless that is what you are looking for . . .
I've used a few different ones and I can't really say which are better then the others since they all seemed to work fine. All I can offer is that by a significant name brand one from a legit retailer and expect to pay at least $1000 for something decent.
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