The pros and cons of testing instruments and equipment directly restrict the accuracy of testing data. Tens of thousands of products in the instrument and equipment market with mixed quality test the purchasers. How to cut out the complicated and simplify, and cultivate a pair of discerning eyes? Guo Baolin, head of Qingdao Bay Bridge Engineering Technology Research Center, knows this well. From a purchase list drawn up by him, we can understand the hard work and sweat behind this engineer who always advocates "throw grass and beat rabbits—multitasking with one mind".