Stopwatch for sport and the lab: how to choose one, what it costs

The right stopwatch depends on the job. For timing laps in training, a simple digital model with 0.01-second resolution and memory for a few split times is enough; for school and lab experiments, a large display, a reliable button, a countdown function and, where needed, a calibration certificate matter more. Remember: in hand timing the main error comes not from the device but from human reaction time.

Short answer: as of 22 September 2026, Prayk has 28 listings mentioning "saniyəölçən" (stopwatch); the median price is 65 AZN and half sit between 29 and 121 AZN. Simple plastic sports stopwatches cost 6–10 AZN, and a model with memory for 100 results costs 26.8 AZN. There is no dedicated stopwatch section; the nearest is Measuring tools (216 listings, median 38 AZN).

What types of stopwatch are there?

According to the US National Institute of Standards and Technology (NIST) guide to stopwatch calibration, 0.01 s resolution is common for digital stopwatches, some devices offer 0.001 s, and mechanical stopwatches usually resolve 0.2 s. The tolerances cited in the guide allow a mechanical stopwatch to drift up to 15 seconds a day, while requirements for quartz models are stricter.

Resolution vs accuracy: what is the difference?

Seeing hundredths of a second on the display does not mean the measurement is accurate to hundredths. Resolution is the smallest time step the device can show. Accuracy is how closely its time base — the quartz oscillator — keeps time, usually stated as "± N seconds per day". The stopwatch used as an example in the NIST guide is specified at 5 seconds per day, which is about 0.2 seconds over an hour of timing. In a study described in the guide, roughly 70% of more than 300 quartz wristwatches kept time within 1 second per day or better — so for training, a quartz stopwatch's own error is tiny.

In hand timing, the biggest source of error is human reaction time. In the experiment described by NIST, operators' average reaction error was usually under 100 milliseconds, but in the worst case exceeded 700 milliseconds. So when you hand-time a 100-metre sprint, the hundredths on the display are approximate and thousandths add nothing useful. That is why official competitions use electronic timing systems. In training, what matters more for comparing results is that the same person times with the same device.

What to look for in a sports stopwatch

• Split and lap. Split records an intermediate time without stopping the total; lap shows each lap's time separately. Running and swimming sessions need both.
• Memory. Simple models store one or two results, professional timers dozens or hundreds — the WS2019 model on Prayk, for instance, stores 100. For a coach working with a group, that replaces the notebook.
• Buttons. Choose large buttons with a clear click that work with wet or gloved hands; start/stop should sit under your thumb.
• Water resistance. Splash resistance is enough at the poolside; whether the device can be submerged is stated separately on the box.
• Display and battery. Large digits readable in sunlight and a standard, easily replaced battery.
• Extras. A countdown timer, pace beeper (metronome), neck lanyard and alarm make a coach's work easier.

What matters for labs and schools?

• Calibration. Research and quality-control labs may require a calibrated measuring instrument with a certificate. In that case, have the device checked by an accredited calibration laboratory; the NIST guide describes in detail how stopwatches are compared against a reference time signal.
• Countdown and alarm. For reaction and incubation times, countdown timers and multi-channel models that track several processes at once are convenient.
• Mounting and housing. A magnet, stand or clip, and a housing that is easy to clean and resistant to chemicals.
• School experiments. In pendulum or free-fall experiments, instead of timing a single swing, time, say, 10 swings and divide by 10: the reaction error shrinks tenfold. NIST likewise recommends lengthening the measured interval to reduce the effect of reaction error.

School supplies are in School and learning supplies, and measuring instruments in Measuring tools.

How much does a stopwatch cost on Prayk?

The figures were measured in the Prayk catalogue on 22 September 2026. There is no separate stopwatch section, so listings were selected by title search.

The "saniyəölçən" search also catches watches with a stopwatch function and other devices, so the 65 AZN median is not the price of a pure sports stopwatch: as the examples show, simple models cost tens of manats or less. 27 of the 28 listings are in Baku. Sellers use the word "saniyəölçən" in their listings, and a search for "sekundomer" finds nothing — as a buyer, try both words; as a seller, put both in the title. Watches with a stopwatch are in Wristwatches and Smart watches, and sports accessories in Fitness accessories. If the model you need is not listed yet, save your search to be notified as soon as a new listing appears.

Stopwatch, smartphone or sports watch?

A smartphone app is free and fine for personal training, but screen lock, touch-screen lag and incoming calls distract a coach, and a phone is at risk by the pool. A sports watch is handy for timing your own workout, while a dedicated stopwatch's physical button is more reliable for timing others. A lab needs a separate calibrated device: a phone has no calibration certificate.

Frequently asked questions

What is the difference between a stopwatch and a timer?

A stopwatch counts up from zero and shows elapsed time; a timer counts down from a set time to zero and sounds an alarm. Most digital models have both functions.

Is there a difference between a 0.01 s and a 0.001 s stopwatch?

That is display resolution, not measurement accuracy. With manual start and stop, human reaction error in the NIST experiment was usually under 0.1 second on average, but in the worst case exceeded 0.7 second. So 0.01 s is enough for hand timing; 0.001 s only makes sense with electronic start and finish sensors.

What are split and lap?

Split records an intermediate result while the total time keeps running (for example, every 100 metres of a 400-metre run). Lap shows each lap's time separately. Both help you see how pace was distributed in a running or swimming session.

How can I check a stopwatch's accuracy at home?

Start the stopwatch at the same moment as an accurate time source and compare after several hours, ideally a full day: the longer the interval, the less your reaction error matters. Compare the difference with the manufacturer's "± N seconds per day" specification. A lab needs calibration by an accredited laboratory.

How much does a stopwatch cost on Prayk?

As of 22 September 2026, Prayk has 28 listings mentioning "saniyəölçən" (stopwatch); the median price is 65 AZN and half are between 29 and 121 AZN. Simple plastic sports stopwatches cost 6–10 AZN, and the WS2019 model with memory for 100 results is offered at 26.8 AZN.

Which stopwatch do I need for swim training?

Choose a splash-resistant model with large buttons that work with wet hands, lap memory and a neck lanyard. Submersion resistance is a separate rating, so check it on the box or in the manual.

Sources and methodology

Listing counts and prices come from Prayk's public catalogue API on 22 September 2026: catalogue-wide title searches for "saniyəölçən" (stopwatch), "sekundomer", "sekundometr", "stopwatch" and "taymer" (timer), plus the Measuring tools section (all 216 listings). Medians and ranges (25th–75th percentiles) use only listings priced in AZN. Information on resolution, accuracy tolerances and reaction time comes from the official guide NIST Special Publication 960-12 — Stopwatch and Timer Calibrations (2009). Check the accuracy of a specific model in the manufacturer's technical documentation.