This is a MKS Granville Phillips Linear Analog Output Module and provides three, zero to +10 Vdc, linearized voltages that correspond to the displayed pressure readings of the 307 Vacuum Gauge Controller. The source for these outputs is the digital data on the controller's internal bus to the Display Module. The analog output resolution is therefore dependent upon this data. The module is intended to be used in a 307 vacuum gauge controller configured with an ion gauge and two thermocouples. The pressure range for the IG linear output is selected by a front panel switch. Four separate ranges are available. For installation, specs and procedures for use, see Chapter 10 of the instruction manual.pdf. This is the Linear Analog Output Module ONLY, MKS Granville Phillips 307 Controller, Cables and Accessories sold separately on this website. The MKS Granville Phillips 307 Vacuum Gauge Controller Instruction Manual.pdf can be downloaded below at DOWNLOADS: