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What does daily deviation mean?
Daily deviation, or rate, is how fast or slow a watch runs compared with a reference clock, expressed in seconds per day. A positive number means the watch gains time; a negative number means it loses time. The right target depends on the watch’s movement and the specification being used.
What is a reasonable daily rate for a mechanical watch?
Start with the manufacturer’s published guidance for the exact model or caliber. General guidance and specifications differ: for example, the following figures refer to distinct watches and criteria, not a universal pass/fail range.
| Guidance or criterion | Published rate | What it applies to |
|---|---|---|
| Casio general mechanical-watch FAQ | Several tens of seconds per day may be normal | General guidance on Casio’s Japanese support site; not a specification for every Casio model. Casio FAQ |
| Grand Seiko 9S instructions | -1 to +10 seconds per day | Normal-use guidance for the covered instructions; a narrower range is stated for a specified caliber. Grand Seiko instructions |
| Seiko 6R21 instructions | -15 to +25 seconds per day | Covered movement guidance at normal temperatures of 5–35 °C; not a range for all Seiko watches. Seiko instructions |
These examples show why a watch should be judged against its own specification rather than an internet-wide rule of thumb. A stated range is tied to the maker’s guidance and conditions; it does not guarantee that every individual daily reading will be identical.
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How do chronometer and Master Chronometer limits differ?
Certification figures are also specific to their test and should not be mistaken for the tolerance of every mechanical watch. METAS, Switzerland’s Federal Institute of Metrology, summarizes the ISO 3159 chronometer movement tolerance as an average daily rate deviation of -4 to +6 seconds per day. Its Master Chronometer criteria for a finished watch require 0 to +5 seconds per day. The first applies to a movement test; the second applies to the finished watch under METAS certification requirements. METAS Master Chronometer requirements
METAS describes the finished-watch criterion this way: “The watch must reach a rate accuracy of 0 to +5 seconds per day, i.e. it must never slow down and not be more than five seconds ahead of the actual time.” This is a Master Chronometer requirement, not a universal standard for mechanical watches.
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How accurate should a quartz watch be?
Quartz accuracy is commonly stated over a longer interval than mechanical daily rate. The Japan Clock & Watch Association describes a general quartz watch as having accuracy of approximately ±20 seconds per month. That is association-level guidance, not a guarantee for every quartz movement or model. Japan Clock & Watch Association: watch accuracy
Why can a watch’s daily rate change?
Actual rate can vary with conditions and use. Manufacturer guidance identifies factors including environment, winding amount, wrist wear, temperature, and arm movement. This is why a result from one day may differ from the watch’s longer-term behavior. Casio FAQ Seiko 6R21 instructions
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How to check your watch’s rate at home
A basic home comparison can show whether a watch is consistently gaining or losing time. It is not an accredited chronometer test and does not reproduce formal instrument measurements. METAS defines instantaneous rate by comparing an instrument with a reference clock and expressing the difference in seconds per day. METAS-N001
- Choose a trusted reference. Use a reliable time source and note the exact time at which you set or compare the watch.
- Keep the comparison consistent. Compare at roughly the same time each day and use the watch in a consistent way during the observation period.
- Record the difference over several days. Note whether the watch is ahead or behind the reference at each comparison; do not treat one reading as a diagnosis.
- Calculate the average daily rate. Divide the total seconds gained or lost by the number of elapsed days. For example, a watch that is 30 seconds fast after 6 days has averaged +5 seconds per day over that interval.
- Check the exact model or caliber instructions. Compare the repeated average with the maker’s stated tolerance and its stated conditions.
A timegrapher can provide a more technical rate measurement, but it is optional for this basic comparison. A home result is useful for tracking behavior; it does not certify the watch.
When should you ask for an evaluation?
If repeated, consistent checks place the watch outside the tolerance stated for its exact model, ask the seller, manufacturer, or a qualified watchmaker about an evaluation. Daily deviation by itself does not establish a specific fault or show that regulation is needed.
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