I have 2 sources to choose ...

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 I have 2 sources to choose from.

1. The top choice is always International Ag Labs.  If it is a test kit..... they have it or will design one to fit your needs. 

 2. An electronic device if I remember correctly is called a Hyphal diameter.  This identifies the hyphal of microbes and their energy levels to determine how many  microbes are present and if are one of three groups. Archaea, bacteria, fungi.  Mainly for farmers. But a great first step for a yes or no on the presence of microbes.  Most county agents or state/provincial ag labs have self help kits.