All tire pressure gauges have variable accuracy. There’s an Preliminary “drive” necessary to get matters going, so hardly any can measure all the way down to zero. And mechanical devices are generally rigid In the beginning. Ionization gauges are quite possibly the most sensitive gauges for incredibly lower pressures (also http://pressuregauge97631.yomoblog.com/15306760/how-much-you-need-to-expect-you-ll-pay-for-a-good-pressure-gauge