Scalamp Electrostatic Voltmeter EE 11308/9/10

For high voltage measurements at zero current drain, the SCALAMP ELECTROSTATIC VOLTMETER is the ideal instrument.
 With a three-second period and hairline-spot indicator on a clear open scale, measurements can be taken with great rapidity and ease. The instrument is completely self-contained, all components being enclosed in a robust dust-proof plastic case mounted on resilient feet. Lamp illumination is effected from the mains supply through a built-in transformer or from an external 4V battery.

Scalamp Electrostatic Voltmeters. Three models with these ranges:
E.E. 11308: 1 to 15 kV AC or DC.
E.E. 11309: 3 to 10 kV AC or DC.
E.E. 11310: 5 to 18 kV DC and 5 to 12 kV AC (r.m.s. on AC).

Manufactured by Cam Metric Ltd.

In questo link sono elencati 633 modelli, di cui 488 con immagini e 342 con schemi.
Elenco delle radio e altri apparecchi della Pye Ltd., Radio Works; Cambridge