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Digital tire pressure gauge operates on a 9-volt battery and uses a semiconductor pressure sensor with a resolution as low as 0.1 pounds per square inch (psi).
ELECTRONICS EXPERIMENTERS HANDBOOK 1992 pg. 32, 15

Pressure detector uses a piezo transducer as a sensor in a circuit that responds to changes in air pressure.
POPULAR ELECTRONICS [2] Sep 1991 (v.8#9) pg. 74

Digital pressure gauge is completely portable and has a full-scale range from 0 to 150 psi (depending upon sensor used). Used for measuring tire pressure, vacuum pressure, differential pressure, etc.
RADIO-ELECTRONICS Aug 1990 (v.61#8) pg. 41, 65

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