When you choose this hose connection gauge you can rest assured that you re getting a quality product to test water supply pressures within a distribution system. Its red indicator hand holds at the highest reading registered for detection of thermal expansion pressure surges. It easy to install and no tools are required.Made of steel for durability and strengthEasy to read indicator for detecting pressure surgesFeatures a copper alloy tube sensing elementAccuracy is ASME type BEasy to install with no toolsWorks with many pipe materials