CZ Smart Men's Smartwatch with Leather Strap vs Helio Smart Ring Health Tracker: which is safer?
Amazfit Helio Smart Ring Health Tracker is the clear pick. Citizen CZ Smart Men's Smartwatch with Leather Strap carries a failing PFAS grade, and we never recommend buying a failing product.
Citizen
CZ Smart Men's Smartwatch with Leather Strap
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleFormaldehyde residue in leather tanning
PossibleCoating degradation and particulate release
PossibleStainless steel nickel content
Our pick
Amazfit
Helio Smart Ring Health Tracker
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossiblePolymer band composition and residual monomers
PossibleBacterial growth in sealed band-case junction
Where these two actually differ
- We flag Formaldehyde residue in leather tanning, Coating degradation and particulate release, Stainless steel nickel content and Unspecified waterproof sealant or adhesive on the Citizen and not on the Amazfit.
- We flag Polymer band composition and residual monomers and Bacterial growth in sealed band-case junction on the Amazfit and not on the Citizen.
- The Citizen is Stainless steel case, leather strap, unspecified waterproof coating where the Amazfit is Titanium alloy case, polymer band, which is most of the difference in these two grades.
- The gap is 45 points, wide enough that this is not a close call, and the Amazfit is the one to buy.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
More water-resistant smart rings & bands: see the full ranking