Ppm Meters/How to use em

What's the best ppm meter to buy for a reasonable price?
and
How exactly do i use the ppm meter? lol

Im just a little confused...

I use a $350 hanna instruments, but thats a bit overboard for a new grower. On the flip side if your doing hydro and are in it for the long haul you need one with replaceable tips.
The PPM Meter ( Also called a TDS or Total Dissolved Solids meter) reads the electrical resistance of the water and determines either PPM ( Parts Per Million) of salts ( Fertilizer, Nutes) to water or EC ( Electrical Conductivity). Both PPM and EC can be converted to each other with a formula, depending on the manufacturer of the meter.

Everthing ND said plus:
I use a Control Wizard bought from nehydro.com, about $50 (I have CW ph meter which I could never calibrate so I got a better one with auto calibration). Are you in soil or hydro?
Big difference how you use them. In hydro just fill a shotglass with water and stick it in. Make sure you know the ppm of the water you're starting with. In soil you just test the water for ppm before you add it . For ph you need to soak the soil and test runoff. Either way you will need a calibration liquid, usually 1382 ppm, and ph 4 and ph7 for a ph meter.
Feel free to ask more questions, someone will answer.

Im using soil and a hydro system.
So how do i test the soil's pH? and What should the pH be?

ok, i figured it out here.

ok heres another

oops heres another

fuck lol here it is

wtf, ok here hahaa

see how the top 2 leaves have tilted over to the side?

Yeah your problem is not enough light . if your using Fluoros they need to be 2 inches away, your plant is stretching severely and the weight of the leaves is pulling it over, replant into Rockwool all the way up to the first set of leaves and get those lights closer.

Where can i buy rockwool? Hydroponic store? lol.

and when i get it replant the plant up to the first set of leaves?

The light is supposed to be 2 inches away?

Hydro store, internet, lots of places have RockWool.
Yes replant to the first set of leaves, if you dont the plant is going to fall over.
Depends on the light, what light are you using? Fluoro? HPS? MH? CFL?. I just assumed Fluoro as it seems to be all the rage theses days. If it is indeed fluorescent then YES 2 inches away.

yeah its fluoro

So yeah that plant is 2 weeks old tomorrow, so i should start feeding it like wednesday or thursday?

Ok well then get that light 2 inches from the tops of the plants, that means you will have to move the light up as the plant grows. Hooks and chains works well and is stupid simple to use as a adjustable hanging system for the lights. Good luck!!

Thats 2 weeks old? ok I figured it was just a few days old, you gotta get that replanted and those lights closer and then you can give it 400 PPM in the res to start the nutes. Hydro grows plants very fast.

If so how much nutes do i give it?:

in the res? whats res? lol

res =Reservoir, you said you were using hydro, most hydro systems have some sort of reservoir that holds your nutrient solution and is either pumped periodically over the plants roots, or is oxygenated and the roots basically swim in the solution.