I believe autocal was a Datron brand name that stood for closed case calibration, ie. no need to adjust trimmers, only software constants. Many recent DMMs support this.
You may also be referring to artifact calibration, calibration with just a voltage reference and a reference resistor. As far as I know the HP/Agilent 3458a is the only DMM that supports this, expect to pay a least a couple of thousand dollars on the used market, and more new.