Three MAC-dials (2003) from the Linux implementation of the workstation, showing how the dial changes colour depending on whether the age-corrected total-MAC value is within the normal working range (0.85--1.6) or not. The red dial on the left shows the total-MAC too low. The white dial in the middle shows the total-MAC in the normal range. The red dial on the right shows the total-MAC too high. In this case we are using nitrous oxide and sevoflurane in oxygen.
RWD Nickalls (2009)