crystal calibrator

例句：

1. 1. The crystal calibratoris used to measure the accuracy of opticalinstruments.
   水晶校准器用于测量光学仪器的准确性。
2. 2. The crystal calibrator was usedto check the stability of the temperature sensor.
   使用水晶校准器来检查温度传感器的稳定性。
3. 3. The crystal calibrator was usedto calibrate the microscope'sfocus.
   使用水晶校准器来校准显微镜的焦点。