Waters Xevo TQ MS Operator's, Overview And Maintenance Manual page 92

4 Maintenance Procedures
6. Look through the source window and use the vernier probe adjuster to
position the ESI probe tip so that it is pointing approximately midway
between the tips of the sample cone and corona pin.
92 February 11, 2013, 71500130002 Rev. D
Vernier probe adjuster
TP03128