I hope your eye drops don't use enought salt to float an egg. When I first got this thing I had to make a brine solution to float an egg and then set the cal. number to what I can't rember.
What we are teaching to this lad is, what the difference in water temp., ph, and weather conditions can make to fishing.
Not go out and buy gagets.
Man if your eye drops are that salty, then the Med. Sea is almost fresh water. LOL.