EPA is replacing the Section 608 question bank for the first time in about 30 years, starting January 1, 2027. Examiner is built for the new exam, including A2L refrigerants like R-32 and R-454B, with every answer cited to the regulation.
Free Core diagnostic, then $14.99 once for all four sections. iPhone and Android.
Who it's for
HVAC and refrigeration technicians, apprentices and trade-school students who need Section 608 certification to buy refrigerant and work on equipment, plus experienced techs who want to understand the new refrigerants.
The exam, section by section
SectionCoversTo pass
CoreRegulations, environmental impact, safety, recovery basics18 of 25
Type ISmall appliances (5 lb or less of refrigerant)18 of 25
Type IIHigh-pressure and very-high-pressure appliances18 of 25
Type IIILow-pressure appliances18 of 25
UniversalCore plus Types I, II and IIIEach section separately
Each section is scored on its own, so you can pass Core and Type II and retake only what you missed. Examiner scores sections separately too.
Every answer shows its source.
After you answer, Examiner explains each choice and shows the exact passage the right answer comes from, so you learn the rule, not the question.
Sample question
While recovering refrigerant, a small amount escapes despite proper procedure. Under the Section 608 rules, this release is:
AA violation, because any release of refrigerant is prohibited
BNot subject to the venting prohibition, because it is a de minimis release during a good-faith recovery attemptCorrect
CAllowed only if the appliance holds less than 5 pounds
DAllowed only if reported to EPA within 30 days
The rule bans knowingly venting refrigerant, but small releases that happen during a good-faith attempt to recover or recycle are exempt.
40 CFR 82.154(a)
No person maintaining, servicing, repairing, or disposing of an appliance or industrial process refrigeration may knowingly vent or otherwise release into the environment any refrigerant from such appliances. … De minimis releases associated with good faith attempts to recycle or recover refrigerants are not subject to this prohibition.
Sources
Every question is written from these official, public documents.
No. Certification comes from an EPA-approved certifying organization. Examiner prepares you for its exam.
Does it cover Universal?
Yes: Core and Types I, II and III, scored separately like the real exam.
Are these the real exam questions?
No. The official question banks aren't public. Our questions are original, written from the same official sources the exam is based on, and they follow the exam's official outline.
Do I need an account or internet?
No. Everything works offline and nothing leaves your phone.
What if I find a wrong answer?
Every question shows a short ID. Email it to support@rubberducklabs.io and we'll check it against the source and fix it in the next update.
Is this a subscription?
No. One purchase per exam app, and updates are included.
Examiner apps are independent study tools. They are not affiliated with, endorsed by, or sponsored by the FAA, the EPA, or any testing provider. Questions are original and are not taken from any official exam.
Rubber Duck Labs