4 new Pro calculators
  - pH Adjuster: estimate how much pH Up or Down to add for any tank size
  - EC / PPM Converter: switch between EC, PPM 500 (US), and PPM 700 (EU) with grow-stage guidelines
  - Concentration Converter: instantly convert between %, g/L, mg/L, ppm, and ppb
  - Tank Top-Off: calculate how much nutrient to add when topping off an evaporated tank

  Grow Cycle Planner
  Assign saved formulas to each week of your grow season. Track Seedling, Veg, Bloom, and Flush phases
  across cycles of up to 16 weeks. Load any week's formula directly into the calculator.

  Calculation History
  The last 50 calculations from all tools are now automatically saved and available in the new History
  screen.

  More Formula Calculator tools
  Batch scaling lets you multiply any formula by a custom factor (0.25×, 0.5×, 2×, 5×, 10×). Share your
  results directly from any calculator.

  My Formulas improvements
  Search and sort your formula library by name, date, or category. Duplicate any formula with one tap.
  Export your entire library as JSON and import it on another device.