If it's camera gear, test in condo swimming pool at night when guards can see what the hell you're doing?
went to do snorkel/fins/photo taking pics for my gf in a condo pool once
got told off by a hairy indian who was concerned for his swimming wife
i think most condo pools got rules about late night dipping, but don't be unkind and pretend u are dead to freak em out! hahaha