Gluten tester; simple and fast
You would probably want to create something like an ELISA (enzyme-linked immunosorbent assay), similar to the home pregnancy tests you can buy at the pharmacy. The machine you linked to is to test large quantities of gluten in wheat flour, much more than what it would take to cause illness in someone who is gluten-sensitive.

Doing this at home would probably be rather challenging without a "kitchen lab" that is better equipped than that of the Modernist Cuisine folks as you need to do the following:

1) Create an antibody to gluten. Bind the antibody to your test substrate.

2) Create an antibody to the antibody-gluten complex. Add a marker to this antibody.

3) Put the sample through your test substrate, add the antibody-marker to develop.

It's expensive to do the first time but once you do it you can start to see economies of scale when you ramp it to mass-production.