I have one similar to that on amazon. You can get them cheaper than that on ebay.
http://www.ebay.co.uk/itm/Digital-Ph-Te ... 460492bfbdI've never tried it with meat. It works OK for liquids. I can just about get it to read cheese curds by packing them tightly round the sensor but it's a bit hit and miss. They are reputed not to last very long but at that price...
I think the cheap soil ones with the metal rod are pretty much useless but I haven't tried one for many years. They may have improved since then but Phil's comments imply that they haven't.
This look like a proper thing but 10x the price.
http://www.ebay.co.uk/itm/PH-METER-TEST ... 1c316691f3