School Stopclock TM20A – High‑Accuracy Timer with Split Timing & External Triggering

The TM20A School Stopclock is a robust, easy‑to‑use digital timer designed specifically for educational environments. With large, colour‑coded buttons and a clear 15mm LCD display, it offers exceptional usability for students and teachers alike. The timer provides a capacity of 59 hrs, 59 mins, 59 secs with a resolution of 1/100 second for the first hour and 1 second thereafter, making it ideal for a wide range of science and timing activities.

The TM20A can be operated manually using simple start/stop/reset controls or triggered automatically using 4mm jack sockets for start, stop, and reset inputs. Built with a 30ppm quartz crystal and a fixed calibrated 27pF capacitor, it delivers high‑precision timing in every use. Housed in an impact‑resistant ABS case, the stopclock includes non‑slip rubber feet for stability on the bench. Supplied complete with an AAA battery for immediate use.

Key Features

• Great value school stopclock with user‑friendly design
• Large, colour‑coded buttons for intuitive operation
• Timing capacity: 59 hrs, 59 mins, 59 secs
• 1/100 sec resolution during the first hour, then 1 sec
• Simple start/stop/reset functionality
• Split timing function included
• 15mm LCD display for easy visibility
• 4mm jack sockets for external start/stop/reset triggering
• Fitted with a 30ppm quartz crystal and 27pF capacitor for accuracy
• Impact‑resistant ABS case with non-slip rubber feet
• Supplied with an AAA battery
• Includes downloadable manual for ease of use

Ideal for School Science Lessons & Experimental Timing