This instrument is designed for the same purpose as N1830, but it is fitted with a more powerful generator.
It is specially suitable for testing long lines or those where the insulation is low, and may also be used as a temporary station during construction operations.
The apparatus and battery are completely enclosed in a hardwood case which fits into a strong leather carrying cover with shoulder strap.
Overall dimensions 9 x 9.5 x 4.25 inches.
Weight 13.75 lb.
Introduced around 1934.
Swedish Ericsson No. MB310
Taken from the Ericsson Telephone Catalogue, edition No. 26 Supplement
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