Process Operator Handbook Pro (App Unlock)

Unlock the full Process Operator Handbook, the offline app for wastewater operators, process engineers and trainees. The free version already gives you 68 process calculators, a troubleshooting guide and operating ranges. Pro adds everything you need for exams and long-term plant tracking.

What Pro unlocks

• All 200 exam questions: levels 2 and 3 (experienced operator and process engineer), on top of the free level 1 set
• Mock exams: 20, 50 or 100 questions, scored with a topic breakdown and full review
• Unlimited maths drills: fresh numbers every time, SI or US units, fully worked answers
• Unlimited plants and full trend history: months of trends against your limits, with CSV export
• Results logbook: save unlimited calculator results and export them for your records
• Every future update at no extra cost

How it works

1. Try the free app first at app.wwtpplus.com. It installs on Android and iPhone and works offline.
2. Buy Pro here. You instantly get a download with your unlock code and a one-tap unlock link.
3. Tap the link, or enter the code in the app. Pro unlocks straight away.

One-off payment, no subscription, no account and no ads. Keep your code to unlock Pro again on a new phone.

Values in the app are typical guidance only. Always follow your local regulator, licence and equipment supplier limits.