Bi-directional Double Head- Bi-directional push-pull dual head design, makes measurement easier when tire valve stem stands in different positions, working well with both inner and outer tires, single and dual tires. Ergonomically designed ABS handle, non-toxic, odorless and environmentally friendly, wear-resistant and durable, comfortable to hold. Superior metal connecting rod which is heat-treated at high temperature, high hardness, metal parts are flexibly 360-degree rotatable. "One-button switching, handy to switch between four units simply by pressing the button gently. The tire gauge is equipped with LED flashlight, LCD backlight digital display, easy to measure and read even in the dark. " Especially to trucks, trailers & RVs. Nozzle easily forms a seal with the valve stem in 0.5 increment, giving quick and accurate readings. Fits with 4 settings: 0-230 PS Comes with a hanging hole on the end, can be hung in anywhere, convenient to store, quite space-saving.Rotatable pressure measuring valve