thank you both for your very helpful info. it seems you both agree that maintaining the ph accurately is essential where as with the nutes one can estimate and guess how much to add, and as long as the reservoir nute solution is changed often i can get away with not buying a ec.cf meter for a little while atleast. So i can if i do things correctly see the super effects of hydro DWC as a simple practice tester to convince me about hydro being the better way.
Yep you should be ok with just the PH meter. But like i said, PPM is very nice to have. I think even necessary as we want to get better at growing, producing better weed each harvest.
One thing I'd like to mention since you sound new to hydro: I use the General Hydroponics nutrients. It's a 3 part nutrient system: Flora Micro, Flora Gro, and Flora Bloom. But, I've learned about something called the "Lucas Formula" where you do not have to use the Flora Gro (do a google search, it's EXCELLENT reading). Basically it works like this:
For vegetative growth:
5ml per gallon of water Flora Micro
10ml per gallon of water Flora Bloom
For Flowering:
8ml per gallon of water Flora Micro
16ml per gallon of water Flora Bloom
That's it!!! And I'm getting KICK ASS results with this. I give my girls a fresh batch of nutes once a week (of course I add water to the reservoirs during that week as needed) since I do not have the PPM meter and so can't be sure how much nutrients are left after a week...
Simple and basic. One thing you MUST be aware of is this: DO NOT mix the nutes together. Add them to your water separately. Adding them together in the same container can cause some of the nutes to bind to each other, or lock some out. So I generally fill up my reservoirs, PH my water to 5.3, and then I add the nutes. They are PH balanced and don't screw with my PH too much, but a small adjustment is sometimes needed.
Good luck, and I hope this helps. If you go with different nutes, just be sure to know what you're using and how to use them. At this point, I'm too chicken to try anything else since I'm getting suck kick ass results!!!
-Snut