3 in 1 multifunctional and easy to use: This is a pressure gauge for precise monitoring of tire pressure. It also functions as a tire inflator when connected to an air compressor. Additionally, it features a built-in vent valve for quickly reducing pressure in overinflated tires. High accuracy: Professionally calibrated to provide readings within 1% of actual tire pressure with a 0.1 PSI resolution. Measures accurately from 0 to 250 PSI (0-17.2 bar; 0-1724 kPa; 0-17.5 kgf/cm). Waterproof design with automatic shut-off and valve extension. The quick-locking air line (push-fit gas interface) ensures a secure seal on the tire valve, allowing hands-free operation while using a tire pump. Long service life: Constructed with high-quality stainless steel and brass components for durability. Suitable for use with various vehicles including cars, SUVs, trucks, motorcycles, and bicycles. Automatically turns on and off after 20 seconds of inactivity to conserve battery power. Includes integrated vent valve for rapid pressure release. High-quality construction: Designed with a solid build using stainless steel and brass for rugged performance up to 250 PSI. The rubber hose is insulated and extra thick for enhanced durability. High precision 250 PSI tire pressure gauge. Measuring range: 0-250 PSI. Accuracy: 1% + 0.1 PSI. Displays readings in four units: PSI, BAR, KPA, KG/CM. Button functions: On/Off button (left), unit switch/LED light (right). Compatible with 1/4" NPT air compressor connection (included). Operating voltage: DC 3.1 V (2 AAA batteries included). Instructions: 1. Remove the valve cap from the tire. 2. Attach the brass tip of the gauge to the valve stem. 3. Read the displayed pressure. 4. Connect an air compressor hose to the inflator and hold the handle to inflate or deflate as needed. 5. After use, remove the gauge and press the bleed valve to reset the display to zero. Package includes: 4 valve caps, 1 brass air chuck, 2 AAA batteries, 1 x 1/4" NPT steel fitting, 1 roll of thread sealing tape, 1 pneumatic swivel chuck, 2 sealing O-rings.