Due to the specialty, REF relay is a current relay with very high sensitivity or a voltage relay with very low acting power.
由于零差保护的特殊性，零差继电器本身就是一只灵敏电流继电器或动作功率很小的电压继电器。
Patek Philippe platinum rectangular tourbillon wristwatch with 10-day power reserve indication, circa 2006, REF 5101p.
百达翡丽5101p型号铂金手动上链陀飞轮腕表，备10日动力储存显示，年份2006。
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