Dwyer Instruments 1221-16-W/M analog manometer is a reliable and precise tool for measuring low differential pressures in HVAC systems, air balancing, and laboratory applications. It designed with a durable Flex U-Tube, this manometer operates within a range of -8 to 8 inches water column (wc), ensuring accurate pressure measurements in both positive and negative ranges. Its rugged construction provides long-lasting performance in demanding environments, while the clear scale allows for easy readability. Ideal for MRO professionals, this analog manometer offers dependable results without the need for external power, making it a cost-effective solution for pressure and vacuum monitoring in industrial settings.