CID current meter by CID Ltd, 1987-1990; consisting of meter, calibration unit, bottom sensor head, top sensor head, and three connecting cables. CID current meter by CID Ltd 1987-1990
Amsler electrically registering current meter with case and battery box, by Michael Sendtner, A G, Munich, German, 1913-1916 (see part records) Amsler electrically registering current meter with case and battery box 1913-1916
