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 releasing pressure from 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/cm²). 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 from high-quality stainless steel and brass components for durability. Compatible with all vehicles including cars, SUVs, trucks, motorcycles, and bicycles. Automatically powers off after 20 seconds of inactivity to conserve battery life. Integrated vent valve allows for rapid pressure reduction in overfilled tires. High-quality construction: Noticeable weight due to premium materials. Durable stainless steel and brass build withstands up to 250 PSI. Rubber hose is insulated and extra thick for enhanced performance. High precision 250 PSI tire pressure gauge. Measurement range: 0–250 PSI. Accuracy: ±1% + 0.1 PSI. Displays in four units: PSI, BAR, KPA, KG/cm². Button functions: On/Off button (left), unit switch/LED light (right). Compatibility: 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 head of the gauge to the tire valve. 3. Read the displayed pressure. 4. Connect an air compressor hose to the inflator port and hold the handle to inflate or deflate as needed. 5. Remove the gauge after use and press the bleed valve to reset the display to zero. Included accessories: 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 rotary chuck, 2 sealing O-rings.