CompareOpen in Google PlayApp info
- Installs
- 10+
- Category
- Tools
- Content rating
- Everyone
- Version
- 3.0.0
- Released
- Oct 5, 2026
- Last updated
- 10 Oct 2026
- In-app purchases
- No
- Contains ads
- No
- Promo video
- Yes
- Requires Android
- 7.0
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What's newin version 3.0.0
Operator Toolbox 3.0 — our biggest update yet! • 180 calculators, organized into easy-to-scan sections • NEW Power Plant: real steam tables, boilers, turbines, cooling towers & condensers • NEW Wastewater section + more electrical tools • Exam practice with worked solutions • Rounds & Tasks with reminders • Readings trends, shift handoff PDF & asset tagger • One search box finds everything • Member card, sunlight & glove modes, backup/restore
About this app
Field-ready calculators for water, wastewater, and electrical operators.
Read full description
Operator Toolbox puts 94 field calculators in your pocket — built for water/wastewater operators, electricians, and plant techs who need fast, reliable math on the job, no signal required. ▎ ▎ Categories: ▎ • Chemical dosing and feed calculations ▎ • Water and wastewater treatment formulas ▎ • Pump hydraulics and horsepower ▎ • Electrical calculations (Ohm's law, motor loads, and more) ▎ • Unit conversions for the field ▎ ▎ Features: ▎ • Works fully offline — no internet needed ▎ • Save favorites for quick access to the calculators you use most ▎ • Logbook to track your calculations over time, with CSV/PDF export for reports and recordkeeping ▎ • Clean, distraction-free interface built for use in the field ▎ ▎ Upgrade to Pro to unlock the full calculator library and remove limits.