Importance

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Abstract

The main tool housing of a multi-purpose tool is provided with an adapter that is adapted for coupling with a tire air valve, a finger piece disposed in the adapter and adapted to open the tire air valve, and an air inlet formed in the finger piece to permit entry of air into the main tool housing. A tire tread depth measuring unit includes a measuring rod that extends movably into the main tool housing, and a position sensor for generating an electrical displacement signal corresponding to length of the measuring rod that is extended out of the main tool housing when the measuring rod is used to measure depth of a tire tread. A tire pressure measuring unit includes a pressure sensor disposed in the main tool housing adjacent to the finger piece. The pressure sensor generates an electrical pressure signal corresponding to pressure of the air that enters into the main tool housing via the air inlet. A processing unit calculates a measured tire tread depth based on the electrical displacement signal, and a measured tire pressure based on the electrical pressure signal. The processing unit controls a display unit on the main tool housing so as to show the measured tire tread depth and the measured tire pressure thereon.

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First Claim