记录针 meaning in English

recording needle
stylus point

The instrument includes a weight suspended in a spring connected to a registering needle which notes the vibration on a strip of celluloid .
这种仪器有一个重锤悬在与记录针联接的弹簧下面。记录针在一条电影胶片上记录振动。
An instrument for recording variations in pressure , as of the blood , or in tension , as of a muscle , by means of a pen or stylus that marks a rotating drum
压力记录器，记波器一种记录压力（如血压）或张力（如肌肉张力）变化的仪器，它通过一支笔或记录针的方式描出旋转的轨迹