Microscopes have been around since 1590. Up until the age of electronics, they too were personal devices. However, with small camera sensors connected to the lenses, researchers and educators can easily share images on a display in real-time.
Microscopes may be portable, but they aren’t made for fieldwork. Those cameras require power. And traditional microscopes require a level surface that won’t cause back strain, and a good light source, either from electricity, or from an old-fashioned mirror. With increased sophistication comes cost and weight. Scanning Electron Microscopes weigh hundreds of pounds and use dangerous elements. No microscopes travel well.