Calibration Tools is a utility program that provides input metering and tone generation to facilitate calibration of an 888 I/O or 442 Audio Interface.02/23/93 version 1.0 (ships with Pro Tools 2.0)11/28/94 version 1.2 (ships with Pro Tools 3.0)02/07/96 version 1.3 (ships with Pro Tools 3.2)05/14/96 version 1.4 (ships with Pro Tools 3.21)03/21/97 version 1.4.1 (ships with Pro Tools 4.0)09/24/97 version 1.5 (ships with Pro Tools 4.1, 4.1.1, 4.2)09/25/98 version 1.6 (for PT 4.3, Project II)11/19/99 functionality rolled into Pro Tools 5.0.