noun
quartz clock; crystal timepiece
Refers to a clock or watch that uses a quartz crystal oscillator for timekeeping. The term is neutral and used in both technical and everyday contexts.
この水晶時計はとても正確だ。
This quartz clock is very accurate.
クォーツ時計 is a more direct loanword for 'quartz watch/clock', while 水晶時計 uses the native Japanese word for crystal.
Compound of 水晶 (すいしょう, 'crystal') and 時計 (とけい, 'clock'). The term directly describes a timepiece that uses a quartz crystal.