Stainless steel digital pressure gauges feature a large seven-segment, four-digit LCD with bar graph for easy and quick pressure readings. Gauges have min/max readings and choice of units: psi, bar, or mPa. Pressure sensor is manufactured to provide high accuracy and long-term stability. Gauges up to 600 psi use ceramic sensor technology. Gauges 1450 psi and higher use thin film sensor technology. Optional rubber boot 68052-90 offers protection against rough use.