The Macna kit had 5 parameters with 25 to 50 test strips each for $200. I bought an additional 100 test strips of each for $50 and the strips range from $15 to $20 per 100 for each kit. You do also have to buy a app on your phone to use the meter. They have a app bundle for the Marine meter for $19.95 for the 5 kits kit comes with. They are working out better ranges for Calcium and a few others, but I have high hopes as the meter does log parameters on your device. They did say they were new to salt water but the meter was very nice and water proof. You can rinse it off in the sink and just dip meter in tank to get the water in unit. Then you pick parameter you are testing and hit start. A countdown timer starts at 20 and you swish the test strip back and forth 2 times a second for 20 seconds and it logs the test, date, and result on your smartphone device when 20 seconds is up. You will have to buy additional test strips and they are catering a new marine version to our industry and they said the same meter will work for all their tests. When you do add a new test outside the bundle it is an additional $5 per kit on the app store, plus buying the new strips. I bought one because I like all the new tank toys and my parameters get logged on a pad of paper that has been known to get wet so the logging was what sold me.