A photodetector includes a semiconductor substrate, a buried insulator formed on the substrate, a buried mirror formed on the buried insulator, a semiconductor-on-insulator layer formed on the conductor, alternating n-type and p-type doped fingers formed in the semiconductor-on-insulator layer, and a backside contact to one of the p-type doped fingers and the n-type doped fingers. The improved tool broadly includes a spindle or head, a handle and a flexible connection between the head and handle to permit relative pivotal movement therebetween and rubber bumpers to protect against scratching furniture. An ink absorbing member is provided on the bottom of the inner space. The handle is formed on the biting portion and has an arc hole that is defined through the handle to receive impression material.