Abstract: An apparatus for in-situ testing of a linear actuator configured to exert an actuation force in an actuation direction by movement of a first part of the actuator relative to a second part of the actuator. The apparatus includes a test device, a test actuator and a measurement device. The test device includes a first surface configured to contact the first part of the actuator, and a second surface configured to contact the second part of the actuator. The second surface is moveable relative to the first surface to alter a distance therebetween. The test actuator is configured to exert a test force in a direction opposite to the actuation direction, the test force being to drive movement of the second surface away from the first surface. The measurement device is for detecting a change in the distance between the first surface and the second surface.

Abstract: The present invention is a water-resistant, battery-powered, motorized, spinning, hands-free skin exfoliating device comprising a housing and an abrasive surface. The abrasive surface comprises a body and a plurality of abrasive elements positioned on the exterior face of the body. The body and the plurality of abrasive elements are together formed from a single piece of the same material. The housing contains a power source and a motor. The device is preferably placed on the floor of a shower when in use. When activated, the motor causes the abrasive surface to spin so that the abrasive surface will exfoliate dead skin and calluses from a location on a foot when the location on the foot is placed against the spinning abrasive surface.