Gauge: Water Operator Prep
Wastewater operator exam prep
About
Prepare for wastewater operator certification exams with a focus on the math section. This app offers free calculators for essential formulas and provides step-by-step solutions to common mistakes. Practice with timed exams that mirror the actual test format and weighting.
What's New in Gauge
1.0.3
October 18, 2026
This update corrects laboratory, safety and process-control study explanations and adds explicit solution-density inputs to chemical-feed and weight-percent calculations. Computed values now follow your region's decimal separator. We improved large-text layouts, purchase-restore feedback and study reminders, corrected mock-exam scoring to exclude unscored items, and preserved existing study records during content updates. Class III practice is clearly labeled as an older WPI/ABC outline, not the revised 2025 outline. The toolkit contains 49 interactive calculators plus one geometric-mean reference. Confirm which exam your certifying authority administers.
MoreSubscriptions & In-App Purchases
$14.99
Full Unlock
Unlocks every question, solution, and timed exam.
Developer apps
FAQ
Does Gauge have ads?
No, Gauge is ad-free. The app explicitly states 'no advertising' and works without a network connection, ensuring an uninterrupted study experience.
How much does Gauge cost?
The core features of Gauge, including all calculators and 88 practice questions, are free. An optional one-time unlock is available to access the complete question bank and advanced features.
What is the learning methodology of Gauge?
Gauge focuses on practical application by drilling the skill of picking the right formula and managing units under timed pressure. It provides worked solutions with units carried through, highlighting common operator errors.
How does Gauge track progress?
The app offers weak-area analytics and spaced repetition for users who purchase the unlock. This helps identify and reinforce areas needing more study.
What devices does Gauge support?
Gauge is available for iPhone and iPad, making it accessible for mobile and tablet users.
How often is Gauge updated?
The app was last updated on September 14, 2026, indicating active development and a commitment to fixing issues quickly, often within days.
Is Gauge suitable for all ages?
Gauge has an age rating of 4+, making it appropriate for a wide range of users preparing for certification exams.
Can I use Gauge offline?
Yes, Gauge is designed to work with no signal. All content is on the device, allowing users to study in environments without internet access, such as break rooms at treatment plants.
