AEMC ML912 [2126.37] AC Current Simple Logger II (w/ Integral Probes)*DISCONTINUED SEE DL913*. The Simple Logger ® II Model ML912 is a two channel AC current recording device powered by two alkaline batteries. It incorporates two user selectable measurement ranges of 0 to 100 Amps and 0 to 1000 Amps. Line tracking is performed such that 64 samples over one line cycle are taken. Frequency tracking is performed over the range of ±2Hz around the nominal line frequency 50 or 60Hz. Harmonic measurements are calculated from these 64 samples. Harmonics are only available from the Simple Logger ® II Control Panel within the free DataView® software included with the unit.