Ladas & Parry
Pressure gauge
 A pressure gauge for measuring the pressure of a tire, which can also measure the depth of grooves in the tread of a tire includes a housing, which has a face with indicating scales and a side with an opening, the side being perpendicularly connected to the face of the same. It also has tube member with two open ends, the first open end extending outward from the housing and the second open end extending inward into the same. An elongated rod with two ends, the first end being retractably disposed in the tube member and the second end protruding from the opening in the housing and a neck portion is integrally formed and connected with the opening in the housing. An outer member is fitted over the neck portion. 
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G01L G01L G01B
inventional inventional inventional
Tien-Tsai
Huang