Manufactured around 1963..

Technical data:
Volt: 60 mV to 1200 V AC and DC.
Ampere: 60 uA to 30 A AC or DC
Capacitance: 5000 pF to 10 uF
Resistance: 0 ohm to 100M ohm
Decibel: -20 dB to +18 dB

Internal battery: modified to use a type N (LR1) 1,5V battery