Paub meej hom thiab ua haujlwm ntawm lub sijhawm

Ua ntej tshaj plaws, nws yog qhov tsim nyog los qhia txog cov timer uas koj siv, txawm tias nws yog cov tshuab hluav taws xob lossis tshuab, thiab seb nws puas muaj haujlwm ntawm lub sijhawm.
Cov timers hauv hluav taws xob feem ntau muaj cov ntxaij vab tshaus thiab cov nyees khawm, uas yooj yim ua kom pom lub sijhawm teem. Cov ntaub ntawv mechanical cov ntaub ntawv yuav raug hloov kho los ntawm cov pob ntawm cov pob ntawm cov pob lossis hu ua.