Extech STW515 Stopwatch
- Stopwatch
- Green
- 3.2 ounces
- 2.6 × 0.8 × 3 inches
A compact, single-purpose handheld stopwatch built for straightforward interval, lap and race timing rather than wrist-worn or connected features.
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How it ranks among the 48 stopwatches we track
4.2★ across 101 Amazon ratings, Bayesian-smoothed toward the category average.
101 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 Extech STW515 is a handheld stopwatch weighing 3.2 ounces, sized at 2.6 inches deep, 0.8 inches wide and 3 inches tall in a green case. It is built for timing intervals during training, races or lab work rather than for GPS tracking or heart rate.
Extech is better known for test and measurement instruments than fitness gear, and the STW515 reads as a basic single-function stopwatch rather than a multi-sport timer. Its small, light build points to a pocketable design for coaches or officials rather than a wrist-worn training tool.
- 3.2 oz handheld design
- 2.6 x 0.8 x 3 inch case
- Green colorway
- Model STW515
Who it's for
Fits coaches, referees, lab technicians or anyone needing a dedicated handheld timer for intervals or races. Not for runners wanting a wrist-worn or GPS-enabled device.
Strengths and trade-offs
Drawn from this product's published specifications.
- Small and light at 3.2 ounces
- Dedicated single-purpose timer
- No lap memory or water resistance specs given
- No description of button layout or display
Performance notes
As a handheld stopwatch, the STW515 is built around simple start, stop and lap timing rather than connected features. Its compact size and light weight make it easy to hold or clip during a session, though the listing does not specify lap memory count or water resistance.
Specifications
| Brand | Extech |
|---|---|
| Model | STW515 |
| Color | Green |
| Item Weight | 3.2 ounces |
| Dimensions | 2.6 × 0.8 × 3 inches |
How it compares
This product against the closest alternatives we track in stopwatches.
| Product | Amazon rating | Ratings | ProductDome score |
|---|---|---|---|
| Extech STW515 StopwatchThis product | 4.2 / 5 | 101 | 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 Extech STW515
Common buyer questions answered straight from the product spec data - no fluff, no "it depends".
What is the Extech STW515?
It is a handheld stopwatch for timing intervals, races or lab sessions.
How big is the STW515?
It measures 2.6 inches deep, 0.8 inches wide and 3 inches tall, and weighs 3.2 ounces.
What color does the STW515 come in?
Green.