The DPT2641-010D is a differential pressure transmitter that measures the difference in pressure between two points. It has a range of 0 to 10 inches of water column and outputs a 4-20 mA signal proportional to the measured pressure. This device is designed for use in HVAC systems and can be used to monitor air flow, filter status, and duct static pressure. The compact design allows for easy installation in tight spaces, and the rugged construction ensures reliable operation even in harsh environments.