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Measures motor battery pack current and voltage.
Electric Expander Specifications:
Pack Voltage: 0 to 50V (70v with HV recorder option)
Pack Current: 0 to 140 Amps, in approx 70 mA increments
Further reading on these products can be found here;
http://www.eagletreesystems.com/Support/Manuals/ElectricExpander.pdf