Best PH Meter to buy for soil grow???

Can someone please give me some suggestions as to a good reliable and accurate PH meter for me to use in my indoor grows? There are too many out there for me to get something that does not work!

http://www.ebay.com/itm/HM-Digital-PH-80-Water-Resistant-pH-HydroTester-Pen-/251148676591?pt=LH_DefaultDomain_0&hash=item3a79a0adef this is what i use just make sure you buy the storage solution which is sold seperately if ya want it to last a long time. but it's awesome and it's one of the only ones that has autocal in this price range. whatever ya do dont get a milwaukee ph600 i hate those waste of money just spend the 50 and be happy i use this to ph the water before adding to the soil but i use coir also so this may not be what your lookin for but it's been the best out of the 3 i've gotten and i will buy them for as long as they manufacture them if that's kind of a sign of how much i appreciate them.