Comparison with other measurements

• < 2 digits Analog moving needle voltmeter

• 2 digits 8-bit A/D, such as in an old ISA sound card

• 3.5 digits Most modern handheld digital voltmeters 12-bit A/D installed in cheaper computer cards

• 4.5 digits Std lab bench voltmeters, usually with lockin 16-bit A/D in a high quality data acq cards

• 6 digits What we're achieving with a Linux computer can see incredibly subtle signals and changes