I have asked a number of test kit manufacturers to provide sample kits and information if their kit is suitable for beer.
Gluten-in-Food Kit/Imutest: I have received prompt feedback from Imutest and a Gluten-in-Food Kit (5 tests) for free. Find some more information about the kit and pictures here.
GlutenTox Home/Biomedal: Also prompt feedback from Biomedal and a GlutenTox Home Kit (5 tests) for free. Find some more information about the kit and pictures here.
EZ Gluten/ELISA Tech: Prompt feedback from ELISA Tech. offering a free EZ Gluten Test Kit – 5 Pack but I should pay $115 for shipping. As the regular price for the kit is $60 I refused.
AgraStrip Gluten G12: Prompt feedback from Romer Labs saying that AgraStrip Gluten G12 is not suitable for testing beer.
Kit pictures: Gluten-in-Food Kit on the left, GlutenTox Home Kit on the right