I have six marine test kits They have all been used. I bought them second hand and do not need them. Not sure how much is left in them or how good they are. There is also a surface skimmer, small internal filter and a small air pump. Also there is a 1 litre bottle of liquid that says it removes nitrates and phosphates, it is nearly full. Collection for the items is from Shiregreen S5. I won't post or deliver. £15 for everything.