i just got this tire pressure measurement device. para siyang ballpen tapos may bar na magslide-out na may graph that tells you the pressure of your tires. problem is, yung graph hindi in psi (tama ba?). anyone know how to convert or kung ilang lbs pressure yung 30psi. nakikita ko kasi na divisions niya 1.5, 2.0, 2.5 etc. 3 gulong ko nasa 1.5 tapos yung isa nasa 2.0.
maraming salamat po. pasensiya na newbie lang po.


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