Multi-purpose tool with display unit for showing tire pressure and tire tread depth thereon

A multi-purpose tool, comprising:

• a main tool housing provided with an adapter that is adapted for coupling with a tire air valve, a finger piece disposed in said adapter and adapted to open the tire air valve, and an air inlet formed in said finger piece to permit entry of air into said main tool housing;
• a tire tread depth measuring unit including a measuring rod that extends movably into said main tool housing, and a position sensor for generating an electrical displacement signal corresponding to length of said measuring rod that is extended out of said main tool housing when said measuring rod is used to measure depth of a tire tread;
• a tire pressure measuring unit including a pressure sensor disposed in said main tool housing adjacent to said finger piece, said pressure sensor generating an electrical pressure signal corresponding to pressure of the air that enters into said main tool housing via said air inlet;
• a display unit provided on said main tool housing;
• and
• a processing unit connected to said tire tread depth measuring unit, said tire pressure measuring unit and said display unit, said processing unit calculating a measured tire tread depth based on the electrical displacement signal and further calculating a measured tire pressure based on the electrical pressure signal, said processing unit controlling said display unit so as to show the measured tire tread depth and the measured tire pressure thereon.