As technology has advanced, so the equipment needed to service and maintain it has advanced; by the 1950s the British Army was fully mechanised and electronics, albeit of early designs, were an ever growing area of military development. This fast was recognised during the Second World War and the Royal Electrical and Mechanical Engineers (REME) was set up to help maintain the army’s weapons and vehicles. One essential tool in the workshop was the microammeter used to measure the current in an electrical circuit. These instruments were fitted in many places, permanently wired into circuits, or available as a separate instrument to use on the work bench. British military microammeters came in a grey wooden box:The grey painted wooden box is seen being used as protection for a wide variety of instruments throughout both the Second World War and the immediate post war period. This example has an etched metal plate screwed to the top, with a /|\ mark indicating military ownership:The front of the box is secured by a metal spring clip:Opening the box reveals the microammeter itself, the lid being cut on an angle so the dial is clearly visible when the instrument is in use:The dial itself is made of paper beneath a glass screen, the date 1952 can be seen written on the face and the needle can swing from -50 to +50 micromaperes:A cloth strap is fastened to one corner to prevent the lid being opened too far:These sort of instruments were very well made and saw service for decades, only being upgraded when newer more accurate digital ammeters started coming into service.