By use of magnetic balance which is general physical experiment instrument, a simple and new method of measuring the charge-mass ratio of electron mass developed.
使用常用物理实验仪器磁天平，开发出用于近代物理实验测量电子荷质比的简易新方法。
2
This paper is concerned with the principle of a non - contact optical instrument for measuring the surface roughness of a magnetic disk with an opto-heterodyne interferometer.
根据外差干涉计量术的原理，研制了非接触式的光外差干涉磁盘表面粗糙度测量仪。
3
Model CTP-F82 Faraday Magnetic Balance is a precision instrument for measuringmagnetic susceptibility of small amount of samples. It is also good for teaching purpose.