This presentation addresses the growing need for accuracy and capable measuring equipment that manufacturers found themselves requiring in the early years that led up to the Second World War. Prior to this, many of the equipment makers had their own in house department to provide their equipment needs. Around this time were the emergence of specialist makers of bespoke test equipment who could improve on the technical capability and compete with the internal cost of such activities. Similar to the talk on signal generators, this presentation will focus on standout designs of the time and the needs of the industry as technical challenges were overcome. Some example equipment from the MI museum will be on display.