A recessed light fixture having a rotation ring allowing rotation of a lamp mounted over the fixture frame aperture, the rotation ring easily rotatable on the frame and held in place by a ring clamp. The APTV measures flow velocity in a flowable medium by injecting a small amount of a conductive tracer solution into a water column. The exterior portion includes stand-offs protruding from the body, such that at least some of the stand-offs are connected to each other inside the interior volume of the body. When converting a directional indicator for an automobile to electronic circuits, the present invention enables the production of a sound for checking operation of the directional indicator that resembles the sound of a relay-type directional indicator.