1.100uV~400V measuring voltage 2.10Hz-2Mhz frequency,Max. up 5MHz 3.Dual channels, ... auto and manual mode of measuring MVT-172D Millivoltmeter Features:100uV~400V measuring voltage/10Hz~2MHZ measuring frequency, max up to 5MHz/Auto ... to change without prior notice. Digital Millivoltmeter,5Hz-2MHz frequency,100uV-400V test voltage, MVT-172D