Brooks Instrument”s 4800 Series LOI provides an interface to view, control, and configure the company”s 4800 Series mass flowmeters and controllers. The LOI provides a 28 mm wide by 11 mm high backlit display that securely mounts directly on top of the mass flow instrument and allows the user to power the device via a DC power adapter. The LOI measures the flow signal level from the Brooks 4800 Series device and displays it on a LCD display. A jog dial button allows the user to send control signals to the Brooks 4800 Series device to adjust the flow, perform a valve override, zero the device, and set device configuration parameters such as gas curve selection, engineering units, high/low alarm, and totalizer functions. It uses LEDs to provide a visual indication of device status and device mode. It also allows the user to connect a remote controller to the device and bypass the local LOI control. This local indication option is a good fit for customers in laboratories or universities. It is also well suited for OEM customers, who might want to use the LOI as a tool to configure their 4800 Series devices.