# Best answer: How accurate is an Apple stopwatch?

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## How accurate is the iPhone timer?

Instead of just counting the seconds after you tap on Start, the Stopwatch app actually records the time and date that you hit that button. It then saves that start time and calculates the amount of time that has elapsed since then. … That roughly translates to 78,888 hours and 32.80 seconds.

## How accurate is the stopwatch?

The mean reading time obtained with the stopwatch measurements was 4.34 ± 0.57 seconds (196.21 ± 21.79 wpm), versus 4.44 ± 0.59 seconds (192.24 ± 22.20 wpm) by computer measurement (r = 0.84).

## What is the uncertainty of Apple stopwatch?

The stopwatch manual states that the stopwatch has an uncertainty of±0.05 s ± 0.05 s .

## How long can an iPhone stopwatch last?

So how far does it go? It turns out that Apple’s iOS stopwatch will only keep timing for 99983:00:41.65. As the Redditor noted, “at that point it just start rolling over the hundredths of a second repeatedly but didn’t actually progress past .

## Does stopwatch drain iPhone battery?

The internal operations of the stopwatch app shouldn’t have much effect on the battery at all. … For example, if you leave the app on-screen, then it’ll for sure use more battery than otherwise. But that’s mostly the lit screen eating the battery — not the stopwatch app.

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## What’s more accurate than a stopwatch?

Far more accurate than quartz crystal oscillations are an atomic time clock. With an error of only 1 second in up to 100 million years, atomic clocks are among the most accurate timekeeping devices in history.

## What comes after seconds on a stopwatch?

What is after seconds on a stopwatch? The time measured with these devices can be in hours, minutes, seconds, deciseconds (1 decisecond = 0.1 sec), centiseconds (1 centisecond = 0.01 sec), milliseconds (1 millisecond = 0.001 sec) or measuring even the lesser time intervals.

## Does a timer have an uncertainty?

The uncertainty in the timer is you, the electronics of the timer are assumed to be accurate enough to produce negligible errors. It takes your brain some fractions of a second to process information. This can vary between 0.1 to 0.3 seconds.

## What is a precise value?

Accuracy refers to the closeness of a measured value to a standard or known value. … Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise.