Deltec 500 amp 50 mv MKB C shunt - Brand new but slightly tarnished brass

Description

There is a some tarnishing on the brass parts of these shunts so I am offering them at a very low price.  They are 100% functional and new
The Deltec DC Ammeter shunt is designed to provide the highest quality performance possible while maintaining their rugged construction characteristics. All Deltec Shunts current shunts are designed and calibrated at the factory to have standard accuracy of ± 1/4%.
For continuous operation, it is recommended that shunts are not used at more than 2/3 of the rated current under normal operation conditions. Shunts should be located in an area where freely circulating air is available. If this is not possible adequate forced ventilation should be provided to keep the shunt operating temperature at -40° to +60°C. Shunt temperature must be maintained under 145° C or a permanent change in resistance will occur.
The terminal blocks on the ammeter shunts are made of high quality brass to allow proper heat dissipation and provide strong support for the entire shunt. The resistance blades are made from manganin shunt metal for its low temperature co-efficient, long-term stability and strength. The manganin strips are soldered into slots in the brass terminal blocks with high quality solder to provide a strong, lasting bond. Where mounting bases are provided, high strength phenolic is used with mounting holes designed in for ease of use.
Dimensions are 3.25 inches by 1.75 inches by 1.75 inches high.
The MK series of electric current shunts are manufactured to meet the stringent requirements of GSA federal CID-A-A-55524 specifications.  This CID supersedes MILS161B.