Industrial Circuit Tester 785 Type 4

• alternative name: Jewell

Instrument fixed in a solid oak case, panel of tester made of plain bakelite. For operating it uses 2 x Burgess 7.5V battery No. 5540 plus 1 x "D" size battery 1.5V.

Versatile tester for trouble shooting. Provides voltage, current and resistance ranges for checking motor and control circuits, lighting circuits, sensitive relay circuits, electronic circuits, etc. ( D-C sensitivity 20,000 Ohms per Volt )

0 to 1,000 Volts DC at 20,000 Ω/Volt
0 to 750 Volts AC at 1,000 Ω/Volt
0 to 10 Amps DC
0 to 10 Amps AC
0 to 900 MΩ

Type 4 is identical to Type 3, with the exception that the instrument of the latter features a complete metal base and can be lifted out of the wooden box.

In questo link sono elencati 191 modelli, di cui 168 con immagini e 102 con schemi.
Elenco delle radio e altri apparecchi della Weston Electrical Instrument Co.; Newark, N.J.; (Jewell Electrical Instrument Co.; Chicago, IL)