Omni-tools are multipurpose, arm-mounted microcomputers used for a variety of tasks across civilian, corporate and military sectors. In the civilian sector, they can be used as diagnostic and manufacturing tools, as well as personal entertainment. In the military, omni-tools are often used by combat engineers for hacking, decryption, repair or communication. Some omni-tools can perform better than others, with some only possessing basic features and applications, while others, like military-grade omni-tools, can perform complex tasks. 

Originally invented by the quarians in 1158 CE, the omni-tool has evolved to become the galactically accepted microcomputer, with them being available on almost every world and utilized by almost every government.