Casio SP-410
Timing Data
This watch was spec'd to 15 SPY but is currently performing at about 68 SPY. This makes it the worst of my 4 MHz watches and possibly the first of my Casios to suffer my attempts to trim it. It is, however, the best-performing of my 4 MHz watches in that its rate has been almost rock steady.
Day | Deviation | SPY | Correction |
0 | -0.174 | 0 | |
20 | 3.566 | 68.2 | |
61 | 11.262 | 68.4 | |
88 | 16.334 | 68.4 | |
96 | 17.868 | 68.5 | |
105 | 19.582 | 68.6 | |
111 | 20.546 | 68.1 | |
117 | 21.566 | 67.8 | |
124 | 22.764 | 67.5 | |
130 | 23.77 | 67.2 | |
137 | 24.06 | 64.5 |
Graph showing trends in deviation from Standard Time (in seconds) and rate (in seconds per year)
A Note on the Accuracy and Reliability of Timing Results
There is always going to be an unknown margin of error in any method of timing, and I estimate that each timing event could be off by as much as 0.1 second (though in practice I believe my results to be somewhat better than this). As a consequence of this potential margin of error, results over short periods of time are unreliable. Ultimately, the only result that matters is that which comes at the end of a full 365 days. Where interim results show consistent timings or steady trends, however, then it is safe to assume that those results are fairly accurate.