In the top grade the expected maximum variation in rate between positions is 15 seconds per day and the accuracy is ±4 seconds per day (the movement is adjusted to five positions). The most precise watches will still lose or gain seconds every single day, which means the time on your watch can quickly become off by minutes or even hours.To limit how often you must reset it, you want the most accurate mechanical watch you can get, which means we need to know exactly how accurate a watch can be. To put this in perspective, the +/-10 seconds per day corresponds to 0.011% inaccuracy over the span of a day – which is still quite good in my opinion. So what is considered a good accuracy for an automatic watch? As you will see later on, each watch manufacturers have their own published specification for accuracy depending on the movement which is the range of accuracy that you should expect to get. Seiko, Citizen and other watch manufacturers make watches that easily hit the sec/day accuracy standard for certification. From the above list, we can see there is a huge difference between Japanese-made and Swiss-made movements. This will enable the watchmaker to adjust the watch specifically for your needs which will give a much higher accuracy over time. Automatic Watch Accuracy: How Accurate Are They? Though I’m sure the 20+ seconds per day is still within the Bambino’s specification, it’s definitely not a good experience for real life use. Now, most would say that's not very accurate. To get a COSC certification, a watch movement must pass all the tests for its movement type; coming up short in just one will result in the watch failing this strict test. The extremes tested by COSC, 8 degrees Celsius (46.4 degrees Fahrenheit) and 38 degrees Celsius (100.4 degrees Fahrenheit), are the temperatures at which you’ll start to see an effect on watch movements. Any device that has moving parts is never going to attain one hundred percent accuracy. Retired so don’t wear it all the time, like doing yard work or using the computer or iPad. Best Rugged Smartwatches Reviewed: Find the Most Durable Tactical Smartwatch, 15 Best Military Watches: Tactical Watch Review, Different Types of Watches You Have to Know, How to Get Water & Moisture Out of a Watch, Average daily rate of seconds lost or gained, Mean variation in rates (or how consistent the loss or gain is over a period of days), Difference in the rate of seconds gained or loss in either vertical or horizontal position, Largest variations in rates (including in different positions), How much variation there is at different temperatures, Rate resumption (indicates how reliable the watch is over time; it’s calculated by taking the mean daily rate on the last day of testing and subtracting the average mean daily rate of the first two testing days). One of the most common questions regarding automatic watches is the accuracy. What are Automatic Watches? Last but not least, any damage to the movement due to sports or sudden impact can impact its accuracy. Some of these parts are extremely small, which means that a very small change in size of any of those parts can become magnified as the watch movement works. The chronometer certification requires a watch to keep an average daily rate between the parameters of +6 – 4 seconds per day, as measured over the first ten days of testing. Metal will expand at high temperature (anything above 40 degrees Celsius, such as in Sahara desert) and will contract at low temperatures. I could have sent it back but cancelled that and am keeping it. I'm a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn fees by advertising and linking to Amazon.com and affiliated sites. 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