The Model 419A is housed in a standard -hp-1/2 module case. A rechargeable battery power supply allows operation independent of ac line. Range and function switching is accomplished by front panel controls. The Model 419A provides 18 end scale dc voltage ranges in a 1, 3, 10 sequence from 3 microvolts to 1000 volts. The Model 419A also provides 7 end scale dc current ranges from 30 picoamps to 30 nanoamps. An internal bucking supply allows voltages up to 300 millivolts to be measured with infinite input impedance. The input impedance for the higher ranges is 100 MΩ