Marathon ST083021 Stopwatch
- Stopwatch
- Black
- 2.1 ounces
A lightweight, single purpose stopwatch from Marathon for anyone who wants dedicated timing without pulling out a phone.
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How it ranks among the 48 stopwatches we track
4.4★ across 378 Amazon ratings, Bayesian-smoothed toward the category average.
378 Amazon ratings, weighted on a log scale so huge counts don't drown everything.
Modest tracked demand last month.
Brand identity, imagery, description and spec coverage.
The ProductDome score is separate from the Amazon rating shown above: it combines the Bayesian-smoothed Amazon rating with evidence volume, tracked demand, and data quality across the 48 stopwatches we track - how the scorecard works · full stopwatches data report. Confidence: medium - useful but incomplete evidence.Last refreshed Aug 4, 2026. Data-computed, not a hands-on test. Compiled by the ProductDome Research Team.
Overview
The Marathon ST083021 is a black stopwatch weighing about 2 ounces, built as a dedicated timing tool for coaches, teachers, and athletes rather than a multi-function watch.
A stopwatch like this earns its place on a coach's clipboard or in a classroom because it does one job without the menu digging a smartwatch requires: press start, press stop, read the split. Marathon builds basic timing instruments, and this model keeps to that single purpose rather than adding fitness features.
- Weighs 2.08 ounces
- Black finish
- Dedicated stopwatch function
- Model ST083021
Who it's for
Works for coaches, referees, teachers running timed drills, or anyone who wants a dedicated handheld timer instead of a phone app. Not a fitness tracker and not built for GPS or heart rate use.
Strengths and trade-offs
Drawn from this product's published specifications.
- Lightweight at about 2 ounces
- Dedicated single purpose timer
- No app or pairing needed
- No GPS or fitness tracking functions
- Basic feature set compared to smartwatches
Performance notes
As a dedicated stopwatch rather than a smartwatch, it should power on and start timing without app loading or Bluetooth pairing, which is the main advantage of a single purpose timer over a phone based one.
Specifications
| Brand | Marathon |
|---|---|
| Model | ST083021 |
| Color | Black |
| Item Weight | 2.1 ounces |
Other Marathon stopwatches
How it compares
This product against the closest alternatives we track in stopwatches.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Marathon ST083021 StopwatchThis product | 4.4 / 5 | 378 | 3.5 / 5 |
| Gymboss BLACKBU StopwatchGymboss | 4.5 / 5 | 5,500 | 4.3 / 5 |
| ACCUSPLIT 12440191 StopwatchACCUSPLIT | 4.5 / 5 | 3,500 | 4.3 / 5 |
| Learning Resources Simple 3 Button StopwatchLearning | 4.5 / 5 | 3,000 | 4.3 / 5 |
| Sports YS-802 StopwatchSports | 4.2 / 5 | 2,000 | 4.2 / 5 |
Similar stopwatches from other brands
Questions about the Marathon ST083021
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What does the Marathon ST083021 do?
It is a dedicated stopwatch for timing intervals, drills, or events.
How much does the Marathon ST083021 weigh?
About 2.08 ounces, per the listed item weight.
Does the ST083021 track heart rate or GPS?
No, it is a basic stopwatch without fitness tracking or GPS features.