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  1. aisach

    Lets talk about pH testing.

    Amazon and ebay have good selection for less than a scientific supply co. Maybe accumulate over time. The beakers for buffers should be 'designated'. Use a big sharpie marker, and mark them 4, 7, 10, 6, or whichever you use. Rinse after each use and keep together with the coordinating color...
  2. aisach

    Lets talk about pH testing.

    So this is what the equipment and supplies look like. Anyone can set this up for not a lot of money, although these examples show a laboratory setting, that is beyond most of us. Beakers, stir bars, stir plate, lint free kim wipes, rinse bottle, and a waste cup. Lint free wipes. beakers...
  3. aisach

    Lets talk about pH testing.

    One of the reasons that growers don't take pH seriously is because there is a lack of information conveyed to them. A local hydro shop in my town has 5 locations in the state. I talked to the owner about teaching his staff as well as clients about basic lab work necessary for garden...
  4. aisach

    Lets talk about pH testing.

    For the super-geeks: Here is some methodology that is approved for water and wastewater testing of pH A link to the approved EPA method 150.1 in EPA publication 600/4-79/020, March 1983, 550 pages...
  5. aisach

    Lets talk about pH testing.

    Great vacation strategy! You should post a tutorial in the DIY section if you ever decide to build one. Dudes on here love that kind of stuff. And where to buy the parts and access the codes. Sounds cool.
  6. aisach

    Lets talk about pH testing.

    I've seen automated instruments used in the field. They still require the grower to add the buffers and push the cal sequencing button. The function would still be the same, yes? The instrument reads each buffer and does an internal adjustment on each, then provide a slope. This is the same...
  7. aisach

    Lets talk about pH testing.

    Thanks. Love the arches. Very clever. LOL
  8. aisach

    Lets talk about pH testing.

    Thats great. A new meter and some info to go with it. Super clean water wont stabilize, and it'll ruin the bulb. We had to pH our RO/DI water for one of the tests in the lab. Stuff just keeps dropping..... But we maintained our probes to the max. Filling solution, cleaning solution, 3 point...
  9. aisach

    Lets talk about pH testing.

    The small amount of lab work that us growers do is important to us. And there is a need and a desire to understand it. While the details of testing and measuring are minutia to some, the devil is always in the details. There are those of us that are picky how we do things, even if it is only a...
  10. aisach

    Lets talk about pH testing.

    Thats great. Glad you got it taken care of. Knowing and monitoring the range is critical, and having an instrument that you can trust. I'd have mentioned the temp change in a small volume, if I'd known. Yes temp will change the pH by a tenth or two. Information never hurt anyone, and you know...
  11. aisach

    Lets talk about pH testing.

    Im going to order one of those Hanna pens and check it out. Haven't used one of those yet. Cool. Lots of endorsements for those here.
  12. aisach

    Lets talk about pH testing.

    Sorry that your probe is crapping out. Its frustrating when you have equipment trouble. KCl storage solution is generally 3M to 100ml, thats 3 molar. You should purchase it this way from Bluelab, Hanna, Fisher Scientific, Cole Parmer, Hach, or your local hydro store can order it for you. I...
  13. aisach

    Lets talk about pH testing.

    DOER BlueLab pH Pen The manufacturer discusses the checkmark indicator and how to keep the tip wet. Looks like you will need to get some KCl solution for the cap. http://www.getbluelab.com/site/bluelab/files/Product%20Manuals/pH%20Pen/Bluelab-pHPen-ManualENG-MAY13.pdf I stated before...
  14. aisach

    Lets talk about pH testing.

    DOER Tri Meter Looks like the probes are replaceable. So I just watched a you tube video of a guy calibrating this meter you mentioned. I was horrified at his technique. But the steps he was performing seemed to be correct. IMHO He made 3 errors that we teach people not to do when...
  15. aisach

    Lets talk about pH testing.

    Yeh, I kinda glazed over that part a bit, I have to admit. Didn't want to risk my students falling asleep, if you catch my drift. They just wanted to hit the lab and play with the meters. LOL
  16. aisach

    Lets talk about pH testing.

    They all crap out at some point. If you happen to get a good one...great.
  17. aisach

    Lets talk about pH testing.

    The attached publication from Orion is a great resource. This was one of my bibles when I was writing operating procedures for pH analysis, and writing training courses. So much info in there. I caution though, that some of the instruments are expensive and require more attention than most...
  18. aisach

    Lets talk about pH testing.

    An important message on following the manufacturers advice on storage, etc. And never use DI water. Mineral water is probably ok.
  19. aisach

    Lets talk about pH testing.

    Yes great chart. It stresses the importance of an accurate pH reading. The differences are only 0.6 and 0.5 pH units apart. That's what makes proper maintenance and calibration verification really important. That narrow range of acceptability.
  20. aisach

    Lets talk about pH testing.

    Awesome. In Budbro18's picture you can see the glass electrode bulb. Storing in buffer 7 is ok. The industry storage solution is KCl (potassium chloride). Frequent calibration is desired, of course, but since you know your system well, less is working for you. Calibration should depend on...
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