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does anyone have a ph tester (or what ever is called) circuit?

Discussion in 'Electronic Basics' started by delounge, Jul 21, 2003.

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  1. delounge

    delounge Guest

    must be simple
    with some kind of explaination

    thanks for your help


    sorry if i have double posted
     
  2. N. Thornton

    N. Thornton Guest


    Hi

    Most basic ones are just 2 dissimilar metals, one as each electrode,
    plus a small meter. Thats it. Cost a tenner from garden centres, but
    you should be able to make one from junk if you want.

    Regards, NT
     
  3. The explanation you can find in any textbook on general chemistry, in
    your local library.

    As to buying an instrument, that depends on the precission you require.
    They start with cheap soil pH-meters from a garden centre, and end at
    4-figure laboratory instruments. Also, electrodes can be solid state
    (ISFET) or glas-electrodes (which require a lot more care).
     
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