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TDS water meter

HM Digital is a very popular brand and seem to be of good quality. I have their EZ model. I can't tell you if the price is good or not without a little research. You may want to compare the different models they sell and see how well suited this model is to your needs and budget.
 
Ditto. I read decent things about HM before I ended up with the EZ model (price was what I was willing to pay). Also got some generic one that came with my RO unit. The two have fairly close results, plus or minus a few PPM so I can't complain.
 
I use the Truncheon made by Blue Lab. No worry of drying out the sensor, auto shut off, all 3 reading configurations for those who like EC over PPM.
 
You'll hear differing opinions. Some sources say 50ppm and less is safe. Other say 100ppm or less. There are plenty of CP growers how have been happily growing their plants for many, many years with TDS measuring between 50 and 100 ppm.
 
A what about Calibrate? I didn`t do it. How to do it? Because i see on back of TDS meter says : Calibrate with NaCl
 
The meter should be calibrated from the factory, but will eventually need to be recalibrated as the electrodes age. You need to buy a standard NaCl solution of a known concentration or mix one if you have reagent grade NaCl, distilled water and accurate enough measuring devices (scale, graduated cylinder etc.)

Then follow the instructions.

For the UK see:
http://www.tdsmeter.co.uk/products/calibrationsolution.html
 
You'll hear differing opinions. Some sources say 50ppm and less is safe. Other say 100ppm or less. There are plenty of CP growers how have been happily growing their plants for many, many years with TDS measuring between 50 and 100 ppm.

I would personally aim at water well below 50 ppm, particularly if the grower is dealing with live sphagnum composts, which are more easily affected by the accumulation of mineral salts . . .
 
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