1
- a person who tests something, especially a new product（尤指新产品的）试验者; 测试者。
1.1
- a person who tests another's proficiency考官。
1.2
- a device that tests the functioning of something测试器, 测试仪：
a mains tester.
电源测试器。
1.3
- a sample of a product provided so that customers can try it before buying it试用（产）品。