[APD] test kit for K (Potassium)

["DEAN & MELISSA WILLIAMS" <DMWILLIAMS at bigpond_com>]

Hi
Is there a test kit for K (Potassium) I have tried several shops in OZ and have been told there is not one or they donot stock one,
Can anyone help me with a brand and a outlet that I can buy it from ?

Thanking you
                     Dean
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