Metrix - S4 Universal tube tester

Vintage tube tester :

Brand : Metrix ( Centrad ).
Type : S4.

This instrument is designed to check the condition of radio tubes and rectifier tubes.
With various test functions :

- Heater : Adjusts the filament voltage.
- Insulation : Tests the insulation between the electrodes.
- Vacuum : Tests the tube’s vacuum quality.
- Measurement : The actual measurement of emission or anode current.
- G, G1, G2, G3, K, and P : Selector screws or grid connections.
The buyer is familiar with how this works.
The instrument may be set to 110 volts but can be switched to 220 volts; please check this.

Origin : France.
Period ; 1940-1955.
Weight : 5kg.
Dimensions : 350x300x150mm.