I have a digital tester this is my 4th grow btw an I use it every time after I water an it gives me different readings quite a bit an don't know if its reliable where can I get a reliable digital tester or tester kits?
You don't really need to ph your soil. I mean if your using decent soil and testing the water ph you should be fine. But a digital water ph tester is a good investment.
Nope you don't need to test runoff. Ph your water (after you add food) and you should be good to go. Make sure it is in the proper range but soil is a great buffer. I never test runoff or soil and haven't had any issues. I have bad water here high ppm and ph and ended up getting a RO water system. But not required either.
sd404,
The time to test soil ph is before you put a plant in it...when you can still take action to correct. And the best method is to take a bit of soil, add water...shake and then test the water. Soil testers are quite inaccurate. And yes, people do check soil runoff...but usually after they are having plant problems. It can tell you if your soil is toxified from nutes but little else. So a water tester of the chemical drop system will do the best job for you.
JD
SD404,
Yes, certainly within the range of a hobby grower. But they require calibration and proper storage. Why don't you just get some drops to start? Should be fine for a soil grower.
JD
Just follow the instructions that come with it. I've only owned one and it has a tiny screw for calibration. You use solutions of known ph (calibration solution) and be sure it reads accurately on those.
JD