The NEW Scuba Diving Calculators now comes with a Universal Multi Dive Table Planner providing you with the ability to calculate and log all your dives. Designed easy enough for the beginner scuba diver to being advanced enough for Scuba Instructors use. Calculate your Depth, Residual Nitrogen, Time in and Out, PSI used, ABT, TBT, Average Depth and more. Each one of your dives is logged into a database so you will always be able to retrieve them. You can even use Imperial or Metric or both!