Environmental controllers are used to control environmental factors such as temperature, humidity, and air pressure. The environment to control can be an office or workspace, or inside a chamber for testing or process purposes. Environmental controllers for buildings receive inputs from thermostats and space sensors, and can be integrated with air handling units (AHU), variable air volume units (VAV) roof top units (FTU), and fan coil units (FCU). Some devices can also be used to adjust lighting, heating and cooling systems. Choices for functionality include rate indication or control, data logging, and totalizing. The user interface may consist of a digital front panel or analog components such as knobs and switches. Computer-programmable, web-enabled and network-ready environmental controllers are commonly available. Products with digital controls may include integral software. Some environmental controllers have a printed circuit board (PCB) form factor. Others are designed for mounting in a rack, on a wall, or with a DIN rail. Stand-alone environmental controllers are benchtop or floor-standing units with a full-casing or cabinet and an integral interface.