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Thread: Digital PH tester questions

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    swords's Avatar
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    Digital PH tester questions

    I'm interested in getting a digital Ph tester kit to experiment with leaching the lime from my homemade grout rocks for some wet vivariums and was looking at this one:

    Milwaukee PH Tester

    Now my question is that it comes with one packet of Ph calibration stuff, does the packet make a whole bottle of stuff and I just dip the tip into the calibration solution and replace the cap? I read something about storing the Ph calibration fluid in the cap so the tip never dries out?


    I know some of you are gadget hounds so hopefully you can give me some tips here.

    Thanks!

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    BigBella's Avatar
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    You generally dip the tester in an already-prepared calibration solution -- much like the NaCl that is included with some TDS meters . . .
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    swords's Avatar
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    It includes the solution, which is in a packet form.

    My question is do I transfer this solution to a vial with a lid for storage or is the solution only good for one use/test?

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    Let's positive thinking! seedjar's Avatar
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    Neutral calibration solution usually lasts a while if you use it for storage, but I've always used the liquid stuff. Not sure about dried... Seems weird to me, since I imagine getting the ratio of water-to-powder wrong would skew your calibration points.
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    swords's Avatar
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    I've sent a question to the company to see if this packet contains powder or liquid. The picture of the packet says buffer "solution".

    If it is infact liquid, and I place it in a jar I will be able to use it to recalibrate the pen tester over and over? Does the liquid expire?

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    If you want to reuse the buffer solution, you'll need to make sure it's kept in an air-tight container. Evaporation will make future calibrations unreliable. Buffer solutions typically expire within a year, depending on the buffer. I use standard buffers in the lab I work in almost every day. You can prolong the life of your buffers if you keep them in the fridge, protected from light - just make sure you bring them back to room temperature before you calibrate! pH calibrations depend heavily on temperature.

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    Tony Paroubek's Avatar
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    Those packets contain liquid in them.
    Is that a Nepenthes in your pocket or you just happy to see me?

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    swords's Avatar
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    The seller just got back to me this morning, it's liquid. I have plenty of air-tight vials/tiny jars in the garage to store it in.

    So I'll need a new packet of solution in a year, not bad, it seems cheap enough. Is that a year from the time I open it or is there normally a date on the packet stating an expiration date?

    What is the "optimal" Ph testing & calibrating temp? My household room temp is generally 72*-82*F depending on the room.

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