Abstract: A marking implement having a self-contained source of illumination arranged to project a beam of light encircling the marking point on a surface. Angular displacement of a switch actuator connects the illumination source to either an external source of electrical energy for prolonged energization or to internal batteries designed to provide electrical energy for shorter intervals. A plug-in device establishes the energizing circuit from the external source, by-passing the internal batteries.

Abstract: A bicycle wheel spoke tension gauge has a frame provided with a pair of spaced ends from which extend a pair of co-directional arms terminating in hooks engageable with a spoke whose tension is to be gauged. Between the arms is a slidable rod biased toward the spoke for cooperation with a fixed reference point and providing an indication of the tension of the spoke. Advantageously, a wrench in the form of a slotted disk is rotatably mounted on one of the arms for adjusting spoke tension while the gauge is mounted on the spoke.