校准规 meaning in Chinese

control gauge
master gauge

Lamp caps and holders together with gauges for the control of interchangeability and safety
连控制互换性及安全度校准规的灯头及灯座；
Lamps caps and holders together with gauges for the control of interchangeability and safety - lamp caps
灯头及灯座控制互换性及安全度的校准规-灯头、灯座及校准规；
Confirmation method of calibration by visual calibration gauge on magnetic particle and liquid penetrant testing
使用目视校准规对磁粒检验和液体渗透检验进行校准的确定方法
Lamps caps and holders together with gauges for the control of interchangeability and safety - lamp caps , lampholders and gauges
灯头及灯座控制互换性及安全度的校准规-灯头、灯座及校准规；