TDS/PH meter

Discussion in 'Growing Marijuana Indoors' started by HeadStash840, Nov 27, 2010.

  1. #1 HeadStash840, Nov 27, 2010
  2. #2 johneym1, Nov 27, 2010
  3. #3 brownie9091, Nov 27, 2010
    Hanna ph ec and tds meter I think model number 98129 works great couldn't grow with out it
     
  4. #4 HeadStash840, Nov 30, 2010
  5. #5 Raoul, Nov 30, 2010
    Between the two I like the Hanna...
    1. Auto calibration
    2. Never used a SMART

    buy plenty calibration and storage solution(s)
     
  6. #6 Bud Wiser, Nov 30, 2010
    Last edited by a moderator: Nov 30, 2010
    I got a Milwaukee PH meter (one of them $25 jobs on E-Bay via Hong Kong) it works fine but not water proof, as I have found out the times I've fished it out of a bubble bucket. I have a very nice Milwaukee T75 PPM meter for $70 (and waterproof) from the Hydro store were I get my nutes.:smoke:
     
  7. #7 jamesreed, Nov 30, 2010
    Considering the accuracy rating on the Hanna is +/-0.5ph and the Milwaukee is +/-0.2ph, what's the question? With the Hanna, if your reading is 6.5 you could be anywhere from 6-7 :eek: You may as well just get a dropper kit for $8 for that kind of accuracy. Look for one with an accuracy rating of +/-0.1 or better.
    Buy different meters for different tasks, combination electrodes are not as accurate as single purpose electrodes. Jack of all trades, master of none.:smoke:
     
  8. #8 HeadStash840, Nov 30, 2010

    After reading your post i went back and double checked the stats for the hanna it looks like the accuracy for PH is .05 not .5 simple mistake i do shit like that all the time. With that in mind the hanna seems to be way more accurate, but would the simplicity of being able to leave the probe of the Milwaukee in the res out weigh the hannas pros? the lid to my res is not easy to remove I have a secondary res that contains my pump that i can access easily but a friend of mine said that measurements need to be taken as close to the roots as possible. Anyone for or against my friends statement?

    Thanks for everyones help!
     
  9. #9 Raoul, Nov 30, 2010
    I would not leave the pH meter in the res for extended periods of time...
    1. Scale will build up on the probe and reading will become inaccurate.
    2. pH probes need to be kept in specific, high-salt solutions or the magic juice inside the bulb will be depleted and your probe is dead.

    In Bubble Buckets the solution is in constant contact with the root mass. So measuring anywhere is OK.

    Some hydroponic systems are a wick type system and salts (nuits) can build up in the media. Built up salts can shift your pH .. so measuring at the roots (or media exit) makes a certain amount of sense.

    You should also monitor the PPM / EC of the run-off to warn you about salt build up as well.
     
  10. #10 HeadStash840, Nov 30, 2010
    what is meant by run-off?
     
  11. #11 Raoul, Nov 30, 2010
    The solution that runs trough the media and out - perhaps to be returned to the res.
     
  12. #12 HeadStash840, Nov 30, 2010
    Ok thanks for the info I should be starting my grow next week sometime, I plan to start a journal so keep a lookout
     
  13. #13 jamesreed, Nov 30, 2010

    Um, you need to look again. straight copy pasta from the page you linked:

    Accuracy +/-2% Full Scale, +/-0.5 Degrees Fahrenheit, +/-0.5 PH, Pocket (Low Range)

    And you can test the water anywhere in a recerculating system. If your pump is properly sized all the water should exchange quit rapidly; so the PH should be constant throughout the system. If it isn't, you have other problems to deal with.
     
  14. #14 HeadStash840, Nov 30, 2010

    Yeah you def. were right about that my apologies.
    http://www.hannainst.com/usa/prods2.cfm?id=002003&ProdCode=HI 98129
    that is a link to hannas website and this is where i got the .05 from, but I think Im gonna go with the other meter anyway but thanks for your advice.
     
  15. #15 jamesreed, Nov 30, 2010
    Yeah, that's more like it. Someone should email granger and tell them they need to read the specs more carefully :)

    They got the smart meter specs right though. Out of curiosity, why go with the smart when the hanna is 400% more accurate?
     
  16. #16 VeoDigital, Dec 1, 2010
    The price for that hanna is outrageous. They can be had for much less on amazon...

    [ame=http://www.amazon.com/Hanna-Instruments-HI98129-Conductivity-Tester/dp/B002ZG8L58/ref=sr_1_1?ie=UTF8&qid=1291160064&sr=8-1]Amazon.com: Hanna Instruments HI98129 pH, Conductivity, Tds, Temp Tester: Industrial & Scientific[/ame]
     

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