The studies of in-situ Secondary electron yield (SEY) measurement at Main Injector started at 2013. These studies aimed at understand how the conditioning of different materials evolve at Main Injector. The study on TiN coating is about to be concluded after the shut down. I am going to show result of the TiN measurement up to date. Candidates of new samples are studied. There are several carbon based material been considered right now. I am going to show all the options I am considering. The reason I am going for carbon and the option of creating the samples.