Turn on and cut function details: The table shows the turn on and cut situations as pointer moves deasil, and the function is opposite while the pointer moves widdershins.

中描述开关功能是：压力指针位于小刻度值时所有开关功能，即压力指针从小刻度值开始顺时针动时开关状态，当压力指针逆时针转动时，实现开关功能相反。