An apparatus for assessment of a fluid system includes a scaffold housing with a plurality of internal cavities; a debris monitor module assembly to be selectively inserted into a first cavity of the plurality of internal cavities, the debris monitor module assembly to determine wear debris information in a lubricant; a lubricant condition monitor module assembly to be selectively inserted into a second cavity of the plurality of internal cavities, the lubricant condition monitor module assembly to determine lubricant condition information in the lubricant; and a processing module assembly that is configured to be selectively inserted into a third cavity of the plurality of internal cavities, the processing module assembly to provide communication to an external interface of at least one of the wear debris information and the lubricant condition information.