CW21 Certification Water
Resistance V2.0 150 Advanced
Scenario-Based Multiple-Choice
Questions on ISO 22810:2010, ISO
6425:2018, Elastomer Compression
Set Theory, Case Architecture,
Helium Escape Valve Dynamics,
Dry/Wet Testing Instrumentation,
and Forensic Leak Diagnosis for
Professional Watchmakers —
Harrison, Ohio, September 21–25,
2026
Table of Contents
1.
(Questions 1–12)
2.
(Questions 13–36)
3.
(Questions 37–60)
, 4.
(Questions 61–84)
5. (Questions 85–
108)
6. (Questions 109–
128)
7.
(Questions 129–142)
8.
(Questions 143–150)
Section 1: CW21 Certification Framework & Examination
Standards
🟢
• A. They are fully certified as a CW21
• B. They need to pass only the Automatic Chronograph core component to
be certified
• 🔴🔴 C. They must pass the Automatic Chronograph core component and
one additional elective to attain certification
• D. They must retake Theory because elective components do not count
toward certification
CW21 certification requires passing three core components (Theory,
Precision Timing, Automatic Chronograph) and two elective components. The candidate
,in this scenario has passed two cores and one elective, so they need the third core
(Automatic Chronograph) and a second elective.
🟢
• A. $2,200
• B. $2,500
• 🔴🔴 C. $2,200
• D. $1,700
Automatic Chronograph costs $1,200, Water Resistance costs $500, and
Micromechanics costs $500. Total: $1,200 + $500 + $500 = $2,200.
🟢
• A. Troubleshooting a leaking watch case
• B. Repairing a watch case to restore water resistance
• 🔴🔴 C. Manufacturing a custom gasket from raw elastomer stock
• D. Making a watch case water resistant using dry and wet testing methods
The water resistance elective consists of a watch case to troubleshoot,
repair, and make water resistant. Manufacturing gaskets from raw stock is not part of
the elective scope.
, 🟢
• A. The candidate is certified because the average exceeds 5.0
• 🔴🔴 B. The candidate is not certified because the Automatic
Chronograph score is below 5.0
• C. The candidate is certified because Water Resistance compensates for the
low core score
• D. The candidate must retake all components
Each of the 5 items in the examination must be scored at least 5.0. A score
of 4.8 on any component fails that component regardless of performance on other
components.
🟢
• A. All watches, including vintage pieces over 50 years old
• B. Only quartz watches
• 🔴🔴 C. Modern and recent production watches where spare parts are
available
• D. Only watches under 10 years old
A CW21 services primarily watches of modern and recent production where
spare parts are available, according to manufacturer-specified service procedures.
Resistance V2.0 150 Advanced
Scenario-Based Multiple-Choice
Questions on ISO 22810:2010, ISO
6425:2018, Elastomer Compression
Set Theory, Case Architecture,
Helium Escape Valve Dynamics,
Dry/Wet Testing Instrumentation,
and Forensic Leak Diagnosis for
Professional Watchmakers —
Harrison, Ohio, September 21–25,
2026
Table of Contents
1.
(Questions 1–12)
2.
(Questions 13–36)
3.
(Questions 37–60)
, 4.
(Questions 61–84)
5. (Questions 85–
108)
6. (Questions 109–
128)
7.
(Questions 129–142)
8.
(Questions 143–150)
Section 1: CW21 Certification Framework & Examination
Standards
🟢
• A. They are fully certified as a CW21
• B. They need to pass only the Automatic Chronograph core component to
be certified
• 🔴🔴 C. They must pass the Automatic Chronograph core component and
one additional elective to attain certification
• D. They must retake Theory because elective components do not count
toward certification
CW21 certification requires passing three core components (Theory,
Precision Timing, Automatic Chronograph) and two elective components. The candidate
,in this scenario has passed two cores and one elective, so they need the third core
(Automatic Chronograph) and a second elective.
🟢
• A. $2,200
• B. $2,500
• 🔴🔴 C. $2,200
• D. $1,700
Automatic Chronograph costs $1,200, Water Resistance costs $500, and
Micromechanics costs $500. Total: $1,200 + $500 + $500 = $2,200.
🟢
• A. Troubleshooting a leaking watch case
• B. Repairing a watch case to restore water resistance
• 🔴🔴 C. Manufacturing a custom gasket from raw elastomer stock
• D. Making a watch case water resistant using dry and wet testing methods
The water resistance elective consists of a watch case to troubleshoot,
repair, and make water resistant. Manufacturing gaskets from raw stock is not part of
the elective scope.
, 🟢
• A. The candidate is certified because the average exceeds 5.0
• 🔴🔴 B. The candidate is not certified because the Automatic
Chronograph score is below 5.0
• C. The candidate is certified because Water Resistance compensates for the
low core score
• D. The candidate must retake all components
Each of the 5 items in the examination must be scored at least 5.0. A score
of 4.8 on any component fails that component regardless of performance on other
components.
🟢
• A. All watches, including vintage pieces over 50 years old
• B. Only quartz watches
• 🔴🔴 C. Modern and recent production watches where spare parts are
available
• D. Only watches under 10 years old
A CW21 services primarily watches of modern and recent production where
spare parts are available, according to manufacturer-specified service procedures.
