What safety feature requires engagement of both hands before operation?

The two-hand control device is designed specifically to enhance safety by requiring the operator to use both hands simultaneously to initiate a machine operation. This mechanism ensures that the operator's hands are positioned away from any potentially dangerous areas of the machine while it is operating. By necessitating the engagement of both hands, the device reduces the risk of accidental activations and increases the likelihood that the operator is fully focused and prepared for the task at hand.

In contrast, a brake system primarily functions to slow down or stop machinery, and while it contributes to safety, it does not involve a two-hand engagement process. A safety distance calculator is used to determine the appropriate distance that should be maintained between the operator and hazardous machinery but doesn't require physical interaction from the operator like the two-hand control device does. Lastly, a presence sensing device detects the presence of an operator or other individuals in a designated safe area, but it does not necessarily require the simultaneous use of both hands for operation.