A local pawn shop has a kowa tsn 884 for a screaming deal. I haven't seen it in person yet but pictures look like the glass is in good shape. The housing has several scuffs on it. I'm thinking about picking it up. When I go look at it in person, does anyone hava checklist of what to check or look for before buying? This will be my first venture into high end optics, so my highest level for comparison is an athlon ares.