Profile measurements, to ensure the correct anchor pattern, shall be taken at a minimum of three (3) different locations for each working production shift, i. e. twelve (12) hours.

应采用剖面测量法在每个工作生产换班时间也就是每12小时从3个不同的位置进行测量，以确保准确的表面粗糙度。

youdao

It does keep one anchor constant (you are still an employee) while you shift other things (your industry or functional focus).

FORBES: Time To Change Jobs? Balancing A Job and A Side Business, Part 3