Studio Gauge

Gauge

Every Gauge app puts the calculators, reference tables and unit tools first. Those tools are free, need no account or network, and stay that way, because an operator or technician uses those numbers on shift for a whole career. Exam prep sits alongside them: original questions written from public regulation and the underlying engineering, worked solutions that carry the units through every step, and timed practice forms built to the published question count, time limit and pass mark, drawn across every subject area the exam covers. Gauge apps are independent study aids, not official questions, exam simulations, or readiness predictors, and they are not a substitute for the certifying body's current criteria or for the regulations adopted in your jurisdiction.

3 apps · 3 live on the App Store · 3 on Google Play

Apps in this family

Shared approach

Field tools that stay free

Calculators, reference tables and unit tools are the permanent part of every Gauge app. They work with no account and no signal, and they are never placed behind the purchase.

Original questions, written from public sources

Practice items are authored from federal regulation and the underlying engineering. They are study exercises, not official questions, reproduced exam material, or exam simulations.

Worked solutions with units carried through

Every calculation shows its steps. When a wrong answer is off by a known conversion factor, the app flags it as a unit error.

Built to the published area weighting

Timed practice is drawn to the area weighting and calculation load published for the exam named on each app page. Practice scores are study feedback, not a prediction of your result.

Common questions

What is free, and what does the unlock buy?

The calculators, the formula reference and the unit tools are free permanently. They are not a trial and they do not expire. The one-time unlock opens the full question bank, the worked solutions, the timed practice forms and the review tools.

Is it a subscription?

No. A single non-consumable in-app purchase, with nothing to cancel. Whatever you have already earned or completed stays readable regardless of purchase state.

Will this work at the plant, with no signal?

Yes. All content and every calculator are on the device. A connection is only needed to load, buy or restore the unlock, through the App Store on iPhone and iPad or Google Play on Android.

Does the app match my state's exam?

Exam format, grade designations and passing scores are set by the certifying authority in your jurisdiction and vary between them. Each app states the exam and the area weighting it is built around; confirm current requirements with your own certifying authority before you rely on it.

Can I use the calculators for real work?

They are a study and reference aid. Verify any result against your permit, your facility's standard operating procedures, and the currently adopted regulations before you act on it.

I found a wrong answer. What happens?

Email support with the question and what you think is wrong. The developer checks every report and corrects confirmed errors in an update. An automated test suite covers every formula and recomputes each worked solution in code.

Each app also has its own support page. For anything else, email OmarAppSupport@gmail.com.