The CR Roto-Level Control from Conveyor Components Co. protects against material overflow, empty bins, abnormal levels and plugged chutes. The low-torque motor drives a paddle sensor that continuously rotates inside the bin until it detects material. When material surrounds the paddle, microswitches are activated to signal audible or visual warnings to stop operation. The paddle resumes turning once bin material is cleared and the microswitches are deactivated. 800/233-3233; www.conveyorcomponents.com.