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What accuracy & precision do you require? Using an MCU (microcontroller) can be a very easy (ok, relatively easy) way to achieve this. Many MCU's have analog to digital converters (ADC) already built in, ranging from 8-bit to 20-bit resolution. The timing can be in the nSec range. The output can be a serial stream (COM port) or even USB without too much effort. Is using an MCU a viable option?