Aquarium PH up/down???

hi, could somebody please tell me if this PH adjuster would be suitable to use for a soil grow......

http://www.fishandfins.co.uk/ph-up.htm

Thanx

Dude don't worry so much about the ph of the soil it is not that important.A ph tester for the water once the feed has been added is the main stay of the grow.Has long has the water that has feed in is ph'ed right then don't worry.You can take a sample from the run of of the water to get a rougth idea of the soil ph with the same ph kit.