How Accuracy Is Measured
Watch accuracy is typically expressed as a gain or loss over a defined period. Quartz watches are usually measured in seconds per month, while mechanical watches are measured per day.
These figures are obtained under controlled conditions that do not fully reflect daily wear.
What ±15 Seconds per Month Means
A deviation of ±15 seconds per month equates to roughly half a second per day. In everyday life, this level of variation is almost imperceptible.
Most people naturally reset or reference time more frequently than this deviation accumulates.
Daily Reality vs Laboratory Precision
Temperature changes, wrist movement, and environment all influence timekeeping. Chasing extreme precision can sometimes introduce unnecessary complexity without improving daily usefulness.
Stability over time often matters more than absolute perfection.
When Higher Accuracy Matters
Certain professional or technical contexts may require tighter tolerances. However, for commuting, work, travel, and leisure, standard quartz accuracy already exceeds practical needs.
In these cases, clarity, comfort, and reliability often have a greater impact on daily satisfaction.