Range 0.2 micro ohm to 11 ohm
It is a standard testing instrument for accurate measurement of very low resistances such as shunts, copper & aluminum conductors or wire and specific resistance determinations of heavy distribution transformers. The bridge comprise 10 steps of standard resistance of X 0.01 ohms and a circular slide wire having total resistance of 0.01 ohm & divided into 500 equal parts so that each division correspond to 0.00002 ohm (or 20 micro-ohm). It is also provided with 5 multiplier ranges of X 0.001, X 0.1, X 1, X 10 & 100 so that the overall range becomes 0.2 Micro-ohm to 11 ohms. Provided with built in compensation arrangement for taking into consideration self resistance of leads from bridge to test object. Complete with one standardized set of 8 leads for interconnections. All standard resistance coils used inside are of Aged Manganin wire or strip so that overall accuracy of 0.05 % is achieved. This model is mostly used in wire & cable industries & conforms to IS : 694 & 1554 & hence it is also named as Industrial Kelvin Double Bridge.

Accessories
a) DC source of 10 Amps
b) Spot Reflecting Galvanometer
c) Conductivity attachment of 1M length for holding sample