Technical characteristics: 

Working Voltage - 380V-480V.
Counting speed (sensitivity) - 285-335pulse/sec at 1μR/sec.
Plateau slope - not more than 0.125%/V
Background - not more than 75 pulse/minute.

Load resistance - 9-13 MOhm.
Input capacity - 10pF.

The ambient temperature - from -40 ° C to +50 ° C.
Direction of polarity - must be in two opposite directions.

Dimensions:
Total length  - 220mm;
Working active length - 200mm;
Outer diameter - 19mm;
Weight - 40g.