i need a ppm meter what is a good model

I have a TDS-3 i bought off of e-bay.It measured solids and temp,it was around $20.00.
You use it to tell what your nutes levels are in your water.I would also get a ph meter,they are simpler to use than strips.
You can read more about these in the growfaq section at the top of the page.OPH
 
i use a truncheoun meter they take triple A batteries and dont need calibrated ...about 120 dollars tho ....easy to read and completly waterproof
 

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