|D4 - 2 Channel, 24-bit ADC
|High resolution ADC module. Can be used as an alternative to a Keithley DMM.
|D4a - 2Channel, 24-bit ADC
|Redesign of the D4. Added functionality: can be used as break-out module and can do automatic calibration. Recommended over D4.
|D4b - 2 Channel, 24-bit ADC + microcontroller
|Hardware identical to D4, with an added high speed ARM Microcontroller. Can run at higher sample rates and store data locally. Can synchronise with a D5b module. In development