The TM-20A is a high accuracy, easy to use unit that can be used either as a standard timer or may be automatically started and stopped by an externally connected device. * Uses a 30ppm quartz crystal and 27pF fixed calibrated capacitor for high accuracy * External start/stop control connection via 4mm jack sockets * Stop/Start and reset buttons on top of unit for easy activation * Elapsed time function * 15mm LCD display * Housed in an impact resistant ABS case * Requires 1x AAA 1.5 volt battery (supplied) https://elecena.pl/product/27205802/rapid-tm-20a-digital-stopclock 2024-11-10 https://elecena.pl/product/27205802/rapid-tm-20a-digital-stopclock 2025-01-04 https://elecena.pl/product/27205802/rapid-tm-20a-digital-stopclock 2025-04-02 https://elecena.pl/product/27205802/rapid-tm-20a-digital-stopclock 2025-09-13