What I did was purchase two of 'the cheap ebay meters'. Like these ones
http://www.ebay.ca/itm/Dr-Meter-Che...326481?hash=item2a85421351:g:pgIAAOSwKrhVahPH
and compared them to a meters we use at work, and I also purchased buffer solutions. To test and verify. I was supprized the meters were spot on! I treat them very well, ie storage solution, careful handling, cleaning with distilled water, and put back in solution right after use.
I'm probably going to get some hate from this but IMO the $100+ meters aren't worth it for our brewing purposes. Not trying to show boat, but I'm a Instrument Control Engineering Technologist with 7 years in the field and I have access to pH meters and transmitters that cost thousands. I have found the cheapo's from ebay do the job despite what others I find have said about them. I like them.