检流计，电流计一种仪器，用以探测、测量和测定微小电流方向，采用线圈在磁场中产生的机械效果的方法 An instrument used to detect, measure, and determine the direction of small electric currents by means of mechanical effects produced by a coil in a magnetic field.
小型的或微小的尺寸很小或尺寸缩得很小的 Being on a small or greatly reduced scale.
一种需要经过放大才可阅读的微小图象。 An image that is too small to be read without magnification.
