The device used in the method to study the function of the device. And potential hazards of the device. How to protect tools and equipment may not be altered
Using a device that used to work to study how the device works and the dangers that may be caused by a device, method, and do not modify the tool equipment
The use of devices that can be used to work out to be the work of the device and methods hazard protection methods from the device and do not modify the equipment