The Dwyer Industries Differential Pressure Gauge Maghehelic comes with carrying case, and is a pressure gauge specifically designed for measuring pressure in inches of water. With a range of 0 to 0.25 inches of water, this gauge is ideal for HVAC and refrigeration applications where precise pressure monitoring is critical. This product from Dwyer Industries is known for its accuracy and reliability in measuring pressure, making it a valuable tool for professionals in the HVAC industry.