Career roadmap
Four missions and a certification exam for each level. Clear 70% to unlock the next step.
Open the roadmap →Train from CP1 Tester to CP4 Specialist with CP Command. Clear timed missions, solve field challenges built from real survey data, and prepare for certification with free case-based exam questions.
One training game, four ways to sharpen your cathodic protection skills.
Four missions and a certification exam for each level. Clear 70% to unlock the next step.
Open the roadmap →90-second challenges: survey plots, rectifier faceplates, Wenner tests and anode calculations.
Run a challenge →40 free case-based questions per level, with untimed practice and a 60-minute mock exam.
Start practising →Earn XP for your best scores and see how you rank against colleagues.
See the rankings →Four extremely difficult mock exams per certification level: 100 questions each, a 150-minute clock and a score report that shows your weakest topics. One price unlocks all four exams.
$59
Measurements, reference electrodes, field procedures and safety.
Get 4 CP1 mock exams →$89
Rectifiers, galvanic systems, surveys, interference and coatings.
Get 4 CP2 mock exams →$129
Design calculations, groundbeds, stray and AC current, offshore.
Get 4 CP3 mock exams →$159
Electrochemistry, attenuation, standards and program management.
Get 4 CP4 mock exams →Prices in USD, one-time payment per level. Buying for a team of five or more? Email support@negative850.club for team pricing. Original practice questions; not affiliated with AMPP.
The Negative 850 Club is a training ground for cathodic protection testers, technicians, technologists and specialists. The name comes from the criterion every CP professional knows: keep steel at −850 mV or more negative, measured instant-off against a copper/copper sulfate reference.
CP Command turns that knowledge into practice: real field readings, design calculations and case studies that follow common AMPP, ISO, EN, DNV and NACE practice.
The club is independent and not affiliated with or endorsed by AMPP. All questions are original practice material, not actual certification exam items.
Effective October 17, 2026. In short: we keep as little about you as possible, we don't use tracking cookies or ads, and we never sell your information.
This policy explains how the Negative 850 Club ("we", "us") handles information when you use www.negative850.club (the "site"), including the CP Command training game, free Exam Prep and paid Mock Exams.
The site works without an account. When you use it, the following is saved only in your browser's local storage on your device:
We do not receive this information. You can delete it at any time by using "Lock all exams on this device" or by clearing this site's data in your browser settings. Clearing it also removes your saved progress.
We do not sell or rent personal information and we do not share it for advertising. We share information only with service providers who help us run the site (payment processing, hosting and email), when required by law, or to protect our rights and users.
Purchase records are kept for as long as needed for tax, accounting and legal purposes, usually up to seven years. Support emails are kept for as long as needed to resolve your request. Information stored in your browser stays until you delete it.
Depending on where you live, including under the California Consumer Privacy Act (CCPA/CPRA), you may have the right to know what personal information we hold about you, to ask for a copy, to correct it, or to ask us to delete it. We do not sell or share personal information as those terms are defined under California law, and we do not use sensitive personal information. To make a request, email support@negative850.club. We will not treat you differently for exercising your rights.
The site is served over HTTPS, and paid exam content is encrypted in the page. No method of transmission or storage is completely secure, but we take reasonable steps to protect the information we handle.
The site is intended for adults working in or training for the corrosion and cathodic protection industry. It is not directed to children under 16, and we do not knowingly collect their personal information.
We may update this policy from time to time. The effective date at the top shows when it last changed.
Negative 850 Club · 325 27th Street, Oakland, CA 94612 · support@negative850.club · +1 (415) 410-0996
Training for your team, corporate leaderboards or help with the mock exams: get in touch with the Negative 850 Club.
support@negative850.club
325 27th Street, Oakland, CA 94612
+1 (415) 410-0996