The Sinclair SC110 is a low-power, lightweight, portable oscilloscope that was comparable to a standard bench instrument, according to Sinclair. To enable its portable functionality it could be powered by either AC mains power, or by batteries. It featured a 4cm screen, which used the same CRT display as Sinclair's Microvision pocket TVs.

An oscilloscope is an instrument that graphically displays electrical signals and shows how those signals change over time. Engineers use oscilloscopes to measure electrical phenomena and quickly test, verify, and debug their circuit designs.

This oscilloscope dates from c.1979-1980 as it has Sinclair Electronics name on it, which the company was renamed by the National Enterprise Board (NEB) in September 1979. By this time the NEB owned a 73% stake in the company, and Clive Sinclair has resigned in July of that year. In January 1980 the company's name was changed to Thandar Electronics, whose name is on the Service Manual we have for this example in our collection.