Rutherford is a wholly owned subsidiary of Hudaco Trading (Pty) Ltd and a value added company distributing world renowned brands through its four divisions, each one a leader in its category. V.I. Instruments, being one of the divisions, is the sole importer of the Topcon Sokkia range of survey equipment, which involves Levels, Total Stations, Global Positioning and Machine Control Systems. Originally VI Instruments was known as Cooke, Troughton & Simms which was formed in 1937 to distribute survey products in South Africa. It changed its name to Vickers Instruments in 1956 and at the time was owned by Vickers PLC (U.K.) until 1983 when Vickers disinvested and the company was sold to local shareholders. They are also the exclusive importer of the world-renowned Troxler nuclear density gauges and the market leader in compaction measurements for road construction.