Post Office Box 

Plug type, in polished teak wood box with hinged lid and black bake-lite panel lined in white color to show circuit connections. Coils of resistance wire, double silk covered, are wound non-inductively and have a negligible temperature Co-efficient. Three pairs of ratio arms are each 10, 100, 1000Ω and resistance arms contains 16 coils from 1 to 5000Ω with infinity plug. Total value 11,110Ω. Two spring keys having special contact for battery and galvanometer fitted.

*Note: image shown above is for illustration purpose only; Actual image may vary due to specification, Design, Technology and R&D.*