The YB/T 4285-2012 "Test Method for Testing Metal Indentation Hardness Using Portable Hardness Gauges" standard stipulates the specific method and related requirements for the use of portable hardness gauges for the measurement of indentation Hardness of metal materials. This standard is applicable to portable hardness gauges that require the use of test forces and indenters specified in national standards GB/T 231.1, GB/T 230.1, GB/T 4340.1. Portable hardness gauges are mainly used for the measurement of parts with large volume, fixed installation, difficulty in using traditional hardness gauge measurement or cannot be applied vertically. The standard does not address issues of safe use, and users need to ensure that appropriate safety and health systems are developed before use.