WW2 ACWEECO Universal AVO Minor Moving Coil Multimeter

This amazing little gadget is a 1940s WW2 ACWEECO Universal AVO Minor Moving Coil Multimeter made for the British Army.

A wonderful piece of electronic history, it does appear to be working but is being sold as a collectible only, and without probes. 

It measures:-

• DC Volts: 5, 25, 100, 250, 500 
  
• DC mA: 2.5, 5, 25, 100, 500 
  
• AC Volts: 5, 25, 100, 250, 500 
  
• Non-linear scale for 5 volts A.C
  
• Resistance 0- 20k ohm 
  

The instrument was designed to take an EverReady U10 battery, which is now obsolete, and is not included.  An AA cell could be used with, for example, a spacer or modified spring. 

Serial number 115516-1151

The meter is in fair cosmetic condition with surface scuffs and blemishes. 

• AVO Minor Meter: (Acweeco: Automatic Coil Winder And Electrical Equipment Co. Ltd)
• Manufacturing Date: 1940s
• Labelled with the Army Stores Number ZD 00024, and with the military arrow ↑
• Meter Type: Moving Coil Multimeter measures in milliamps and volts
• Body: Black 
• Metal label screwed on the rear with the Instructions For Use
• Approximate Meter Size (W.H.D): 12 cm  x 9.6 cm x 4.6 cm 
• Made in England by The Automatic Coil Winder And Electrical Equipment Co. Ltd, Winder House, Douglas Street, London S.W.1