长度计量仪器 meaning in Chinese

length-measuring instrument

Optical length measuring instruments - basic parameters
光学长度计量仪器基本参数
Dual frequency laser interferometer is the best precise and longest instrument to measure presently . with its good characteristic , the dual frequency laser interferometer is used in many fields , especially in the precise measurement of the long displacement and dimension
双频激光干涉仪是目前精度最高、量程最大的长度计量仪器，以其良好的性能，在许多场合，特别是在大长度与大位移的精密测量中获得广泛应用。