Pocket Microscopes Spirig-30 and Spirig-100 In use the 30- respectively the 100- power SPIRIG pocket microscopes are positioned onto the surface to be inspected, the built-in illumination activated by a slide switch on the side, and then the image focused with the also side located thumb wheel. The "pocket mics" fit smoothly into the hand palms of big and small. Within seconds the micro-cosmos can be explored at micro-cost. The Spirig mics will not and can not replace full grown microscopes, but if you need a detailed view these Spirig's will be ready out of your pocket.