The AM503A Current Probe Amplifier is used with the AM503S system (sold separately). It amplifies and sums the voltage outputs from the transformer and Hall Effect device and outputs it to the measurement instrument. The AM503A uses bright, easy to read LEDs to display Current/Division settings which are controlled with a single knob adjustment. A single push- button provides both degauss and autobalance functions. The AM503A operates in any TM500/TM5000 Power Module (sold separately). The 50 Ohm output of the AM503A can be displayed on any oscilloscope or measurement instrument that has a sensitivity setting of 10mV/Division.