Abstract: A pen-like tire gauge includes a barrel body shaped as a pen, a guide cylinder secured in the barrel body, a plunger slidingly moving in the cylinder and carrying a semi-cylindrical scale having graduations marked thereon to dispose around the guide cylinder and resiliently tensioned by a restoring spring inserted in a bore of the barrel body, and an air adapter adapted to connect a tire inflating valve for measuring air pressure in the tire when the air is directed into the cylinder to force the plunger and to move the scale for its pressure reading and measurement through a transparent window formed on the body.

Abstract: An air inflator includes a double-cylinder body having a first cylinder having its one end connected with a compressed air adapter for supplying a compressed air therein and having its another end connected with an air filling applicator adapted to connect with a tire valve for filling compressed air into the tire, and a second cylinder fluidically communicated with the first cylinder and mounted with a pressure gauge thereon. The first cylinder is formed with an actuating rod reciprocatively moved in the first cylinder for controlling the air flow for filling a tire, or for sensing a pressure gauge for measuring air pressure, or for releasing excess air upon the adjustable depression of a handle pivotedly mounted on the body.