Im not sure if this is where i should post this, if not please tell me where to put it. . . but anyways i just got a trans instruments hydroponics nutrients tester. ( HortiCare Nutrient Check PPM ) the problem is is that this is for testing the nutrients in the water of a hydro system, and i want to test the nutrients in the soil of my soil garden, so my question is can i test the run-off water and get an accurate reading or is there another way to use this to get a good PPM reading on my nutrients? or am i out the 60 bucks i payed for the thing? hopefully this will makes sense to someone and they can help me? any input will be appreciated, thanks.