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Bluelab ph pen dries out...

Discussion in 'General Marijuana Growing' started by shiva71, Feb 1, 2018.

  1.  
    Stink Bug

    Stink Bug Well-Known Member

    Most recommend around 36 months. And that time can shorten if say the bottle is left open for any extended period of time.
     
    since1991 likes this.
  2.  
    ANC

    ANC Well-Known Member

    The bucket looks colored from the top, but try it, when you only have 5ml in the test tube it is pretty much clear.
     
    since1991 and Stink Bug like this.
  3.  
    Cold$moke

    Cold$moke Well-Known Member

    I too have had difficulty using drops while running kelp and.humic extracts

    Even 5 mills is pretty brown
    But i keep drops as back up and to cross check my ph meter
     
    since1991 and Stink Bug like this.
  4.  
    since1991

    since1991 Well-Known Member

    Store your pH probe in kcl solution. Better than water. Keeps the probe "salty" but a sort of clean saltwater. Makes your pH probe last longer. Never store in r.o. water or any water that is close to zero. Not good. Kcl or calibration solution (4.0 or 7.0) is ideal. They are finicky instruments by nature. I use my Bluelab for everything and often. And its a love hate relationship for sure. To clean them use a mild detergent soap and a soft bristle brush. I like the Bluelab cleaning kit. Over 25 years now and Ive used every brand for field use out there except the FET pens which I might try soon. When they start slowing down or the bulb gets cloudy even after cleaning..its time for a new replacement. I grow in Rockwool drip to waste slabs and coco coir. My pH has to be 5.7 to 6.1 no matter what. Iam convinced that many growers problems and so called "nutrient deficiencies" with growing cannabis indoors is directly related to pH problems and either not paying attention to it or using a funky meter. In the past Ive seen rather large operations almost go to shit from mixing up a fresh batch of nutreint solution in the tanks and a wonky pH meter. A functioning and reliable pH meter is as important to hydroponics as the plant itself.
     
    Last edited: Feb 2, 2018
  5.  
    Jypsy Dog

    Jypsy Dog Well-Known Member

     
    since1991 likes this.
  6.  
    shiva71

    shiva71 Well-Known Member

    Lots of good info here thanks. The glass part seems crystal clear. I'll get some stuff tomorrow and hopefully it'll try soaking/recalibrating and hopefully it'll be alright.
    Cheers
     
    OldMedUser likes this.
  7.  
    OldMedUser

    OldMedUser Well-Known Member

    If you're getting some stuff get some storage sol'n too. Doesn't cost much and can keep your pH pen working well for a lot longer. If the pen isn't going to be used for a long time it can be allowed to dry out but needs to soak in storage sol'n for at least 24 hours before starting to use it again.

    If making calibration sol'ns from the powdered stuff that comes with some pens make sure to use distilled water to mix it up to make sure it it is the right pH once mixed. I just buy a jug each of 4 and 7pH sol'ns for about $7 each. Lasts for a long time and you can be pretty confident that it's right on the money.

    :peace:
     
  8.  
    thegambler

    thegambler Well-Known Member

    I have a BlueLab Tri-Meter, which measures pH, ppm and temperature of the fluid. These probes are all replaceable, but I can state if any of them dry out, they become trash. You can find them cheaper, if you search Amazon, Ebay, etc. I like these a lot, they stay calibrated for a long time, are easy to clean and last forever (if you don't let them dry out- LOL).
     
    Grandpapy likes this.
  9.  
    ANC

    ANC Well-Known Member

    Make sure no moisture got into the pen, chuck some dry rice in for a day or so...
    Saved my PPM pen like this the other day (it was cracked in shipping so it leaks if you are not careful).
     
  10.  
    OldMedUser

    OldMedUser Well-Known Member

    PPM probes are supposed to dry out between uses and a temp probe shouldn't be bothered by drying out and I know from years of use with pH pens that they can dry out as long as re-hydrated properly before using again so that statement is fake news.

    Most people just pull a pH pen out of the box and use it without learning anything about their care and maintenance then wonder why their gardens go to crap. I just use pH Perfect nutes so my pen sits waiting until I think I need it for something. Bought it 6 years ago and use it maybe once a year now and it still calibrates and reads fine.
     
  11.  
    since1991

    since1991 Well-Known Member

    And another tidbit of info. The bottles of 4..7..& 10 calibration becomes contaminated easily. Never pour back in used solution into the bottle. And soon as you open a bottle..your on borrowed time for accuracy. They expire quicker than you think amd its best to use once and done fresh calibration satchets. Heed these words.
     
    Stink Bug likes this.
  12.  
    Stink Bug

    Stink Bug Well-Known Member

    The 'bulbs' in pH measuring tools are permeable membranes, Just like many things in our grows and daily lives. Plant roots, peat moss. even the cells in our bodies, semi-permeable or permeable. They each respond differently to wet/dry cycles. Accuracy, health and longevity go hand in hand. Care along the way is the common factor to success.
    Comparing one brand to the next is the same as comparing a defoliated plant to one thats not when it comes to yield comes too mind...
     
    Last edited: Feb 2, 2018
    since1991 likes this.
  13.  
    shiva71

    shiva71 Well-Known Member

    Thats a massive help I ordered some of the powders cos it seems cheaper than buying 4/7 Buffer stuff...and for sure i would have used tap water...many thanks!
     
  14.  
    zem

    zem Well-Known Member

    I use the bluelab pen 3 years old now, and it is good as new. I keep it open all the time and dip it in a full cup of fert solution. This has kept it hydrated without having to worry about the two drops in the cap having dried out. It is a great instrument so far.

    I have tried some of the cheap powders for ph buffers, and they sucked. The ph was not really 4 and not really 7. I resort to buying small liquid sachets 1$ each.
     
  15.  
    shiva71

    shiva71 Well-Known Member

    I saw another yt vid where a guy mixed water and baking soda and said it always comes to 8.9 no mater how much powder you use. As another reference point it might be helpful. Anyone know about this?
     
    since1991 likes this.
  16.  
    since1991

    since1991 Well-Known Member

    Just buy the 4.0 & 7.0 once and done satchets at the local hydro shop or online. There only like a buck or 2 apiece.This is what you want. Designed to make your meter as accurate as possible.
     
  17.  
    shiva71

    shiva71 Well-Known Member

    Im in Europe, 2 x 230ml 4/7 Buffer €30 the pair, is this sh!t normally so pricey??
     
  18.  
    xtsho

    xtsho Well-Known Member

    I love my Bluelab pen. I make sure to store it properly. It wasn't cheap and you can't replace the probe so taking care of it is extremely important.
     
    Stink Bug likes this.
  19.  
    Jypsy Dog

    Jypsy Dog Well-Known Member

    75 bucks and Bullet proof. I've owned almost all of them.
    [​IMG]
     
    Stink Bug and since1991 like this.
  20.  
    since1991

    since1991 Well-Known Member

    You cany get the little Hanna satchets? Or any other brand? Its just buffer calibration. And you dont really want bottles of it. It contaminates and expires alot quicker than you think. You want fresh satchets. Once and done.
     

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