The BasicLine BL570 Universal Isolator and Signal Conditioner is extremely versatile.  It can handle universal DC voltage and current measurement, has 480 switchable calibrated ranges without readjustment and currents up to 100mA are measured directly; higher current via external shunt resistor.  It has a 3-port isolation that protects against incorrect measurements or damage.  This Knick unit comes with some of the highest reliability in the industry backed by a 3 year warranty.