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.

中描述功能：仪压力指针位于小刻度值时所具有功能，即压力指针从小刻度值始顺时针动时状态，当压力指针逆时针转动时，实现功能相反。