The SignalCalc Ace weighs just over a pound, and packs an unprecedented signal processing punch: four input channels, two output channels, one tachometer channel, 40 kHz standard realtime rate (94 kHz optional), and over 120 dB dynamic range. Ace transforms any Notebook computer into a high precision dynamic signal analyzer, one that can travel with you and work professionally - even in the absence of line power. 4 input channels, 2 sources SignalCalcDedicated high speed tachometer input120 dB dynamic range40 kHz realtime bandwidth (94 kHz optional)Intuitive software interfaceRugged and reliable design