Quick answer: The Round Stop Clock is a dial-type mechanical timing instrument used in school and college laboratories to measure short time intervals — for example, timing oscillations of a simple pendulum or reaction-time experiments.
Description
The LabEquip Round Stop Clock features a large, easy-to-read circular dial and a start/stop/reset mechanism operated by a top-mounted crown or button, making it simple for students to time events during physics and general-science practicals. Its round tabletop or wall-mountable design keeps it visible to a group during a demonstration, unlike a small handheld stopwatch used by one student at a time.
Common classroom uses include timing the period of a simple pendulum, measuring reaction times, and timing intervals in kinematics and general laboratory experiments where a shared, clearly visible timer is useful.
Specifications
| Category | Physics Lab Equipment – Timing Instrument |
| Type | Round dial-type mechanical stop clock |
| Typical use | Pendulum-period timing, reaction-time experiments, general laboratory timing |
| Least count | Not specified for this listing – confirm with our sales team |
| Dial size / mounting | Not specified for this listing – confirm with our sales team |
Care & Maintenance
Wind or operate the crown/reset mechanism gently to avoid damaging the internal movement. Keep the clock away from moisture and avoid dropping it, since mechanical timing movements can be knocked out of accuracy by shocks.
Why Choose LabEquip
LabEquip supplies physics lab equipment to schools and colleges, with a straightforward buying process and a sales team that can confirm exact specifications before you order. Explore more of our range below:
- LabEquip home page – browse our full lab equipment range
- Precision Spherometer – another precision physics measuring instrument
- STEM Kits category – more hands-on classroom teaching resources
Frequently Asked Questions
What is a round stop clock used for in a lab?
It is used to measure time intervals during experiments, most commonly for timing the period of a simple pendulum or measuring reaction times in group demonstrations.
How is it different from a handheld stopwatch?
Its larger round dial is designed to be clearly visible to a group of students at once, making it better suited to shared classroom demonstrations than a small personal stopwatch.
What is the least count of this stop clock?
The exact least count is not specified for this listing. Please contact our sales team to confirm the specification before you order.
Is it digital or mechanical?
This is a dial-type (analog) mechanical stop clock rather than a digital timer.
What class level typically uses this instrument?
Round stop clocks are common in secondary school and college physics laboratories for pendulum, kinematics and general timing experiments.
How should I care for the stop clock between uses?
Operate the start/stop/reset mechanism gently, store it away from moisture, and avoid dropping it to keep the internal movement accurate.
Last Updated: September 2026
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