I agree with the guys here soil testers r like said here shit, if anyone use,s them they're grow isn't gonna be a good one, pens and ec pans are best but if your short on cash theres test tub ph tests which are good but coz they work on a colour chart they good to give u a solid reading but with the pens you can get right to the point instead of within the colour chart but i used one and it went well. I only got a pen as i got enough money to pick one up or i would have stuck with the tube, also theres test strips which again are really good. Hope this helps good luck scunk