iTavah Digital Tire Pressure Gauge,150 PSI RV Heavy Duty Dual Head Stainless Steel Made for Truck Car with Larger Backlit LCD, Black 1.HIGH-PRECISION MEASUREMENT: High precision digital display for premium accuracy and great readability, accurate from 5-150psi +/- 0.5psi; Four changeable pressure units: bar, kpa, psi, kg/cm to provide more choices for measurement. 2.POWER SOURCE: 2 LR03 AAA 1.5V required (included); Long life and easy to replace. 3. FINEST DESIGN AND DUAL HEAD: Heavy duty Zinc Alloy Bi-directional push-pull head design for dual (dually) truck & trailer tires. 4. SIMPLE OPERATION: Very simple one button operation to switch units and measure tire pressure; with self-calibrating and auto LCD power off. 5. LCD BACKLIT DIGITAL SCREEN: LCD green backlight digital display, simple to read and use no matter at day or night.