if you are trying to connectorise connections - such as shunt voltages, that are less than 100mV, take care to ensure some current flows thru the connector - i.e. at least 1mA - this will serve to stop the touching faces oxidising over time and essentially going open circuit for low voltages and very little thru current.
p.s. connectorising any important low volt signal should only be done if absolutely necessary because of the above - and the tendency of things to blow up if a current signal goes to zero - when in reality the current is very high.
where it has to happen - gold contacts on male & female and well crimped wires are preferred ...