1940s Universal Avometer Model 7 With Tan Leather Case 

This is a very nice Universal Avometer Model 7, which comes complete with a Tan leather Transit Case. The meter is in pretty good used working condition with some slight scuffs on the surface and a dent at one corner of the base. The transit case is slightly scuffed and worn.

Approximate Dimensions (WHD): 16.7 x 9.4 x 20.4 cm 

A wonderful piece of electronic history, it comes with its original tan leather case but is missing its leads: (although we may be able to supply these if needed). Although it does appear to be in working condition, it is being is sold as a collectible as I can't attest to its accuracy. 

A multimeter, the model 7 measures in ohms, amps, volts and decibels. The working instructions are printed on a metal label on the rear of the instrument.

Made from 1936 to 1948, model 7 has a 1 mA movement and is housed in an aluminium case. This model is renowned for its reliability and robustness such that contemporary vintage service manuals for radios often include voltage values based on this type of meter.

The Avometer is marked:-

• Universal Avometer Model 7
  
• Serial number 35016 A 652
  
• Made in England by Acweeco: Automatic Coil Winder And Electrical Equipment Co. Ltd, Winder House, Douglas Street, London S.W.1
  

Works from batteries/cells (not included): The model 7 used a rectangular 1.5 volt cell with a brass terminal and a flying lead for the negative connection. Highest resistance range requires two 4.5 volt cycle lamp batteries with brass spring connectors.

Range of Measurements

• CURRENT: A.C. and D.C. 0 to 10 amps. 
  
• VOLTAGE: A.C. and D:C. 0 to 1,000 volts.
  
• RESISTANCE: Up to 40 megohms. 
  
• AUDIO-FREQUENCY POWER: 0-2 watts. 
  
• CAPACITY: 0.01 to 20 mFds. 
  
• DECIBELS: -25dB to + 16dB.