no, just 2 instruments, but the spectrolino has /dev/ttyUSB0 and that is "34" according to the list below. 1) Select an instrument, Currently 1 ( '/dev/ttyS0') 2) Measure test patches with current instrument 3) [ Compute Colorimeter Correction Matrix & save it ] 4) Exit '1' 1 = '/dev/ttyS0' 2 = '/dev/ttyS1' 3 = '/dev/ttyS10' 4 = '/dev/ttyS11' 5 = '/dev/ttyS12' 6 = '/dev/ttyS13' 7 = '/dev/ttyS14' 8 = '/dev/ttyS15' 9 = '/dev/ttyS16' 10 = '/dev/ttyS17' 11 = '/dev/ttyS18' 12 = '/dev/ttyS19' 13 = '/dev/ttyS2' 14 = '/dev/ttyS20' 15 = '/dev/ttyS21' 16 = '/dev/ttyS22' 17 = '/dev/ttyS23' 18 = '/dev/ttyS24' 19 = '/dev/ttyS25' 20 = '/dev/ttyS26' 21 = '/dev/ttyS27' 22 = '/dev/ttyS28' 23 = '/dev/ttyS29' 24 = '/dev/ttyS3' 25 = '/dev/ttyS30' 26 = '/dev/ttyS31' 27 = '/dev/ttyS4' 28 = '/dev/ttyS5' 29 = '/dev/ttyS6' 30 = '/dev/ttyS7' 31 = '/dev/ttyS8' 32 = '/dev/ttyS9' 33 = '/dev/ttyUSB0' 34 = '/dev/ttyUSB1' Select device 1 - 34: kr -rj