ID: 
2590
Maker's Name: 
Victorian Meter Laboratory, Melbourne
Where made: 
Australia
Dimensions: 
22.3 × 19 × 11.5 cm

Australian made laboratory AC/DC voltmeter used by Royal Australian Air Force

Scales read 20 - 30, 80 - 120, 60 - 90 and separate connectors give maxima 15 VDC, 30 VDC, 90 VAC, 120 VAC.