/etc/sane.d/microtek.conf is in libsane 1.0.23-3ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # Uncomment following line to disable "real calibration" routines...
#norealcal
# Uncomment following line to disable "clever precalibration" routines...
#noprecal
# Using "norealcal" will revert backend to pre-0.11.0 calibration code.
scsi * * Scanner
/dev/scanner
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