Merit's PDG Series Digital pressure gauges is availablewith a 4" dial and with 1/4" NPT or 1/2" NPT bottom connections standard. Each gauge has a switchable pressure unit to go from Bar to psi, kPa or kg/cm2 and is designed with a robust 304 stainless steel case with 304 stainless steel internals. The 5 digit display comes standard with a white backlight and black numerals for easy viewing. Accuracy is +/-0.4% FSA and pressure readings are updated 3 times per second. The PDG gauge is powered by an AA battery and can also be powered by a USB or X3 cable connection. A peak pressure hold feature is also standard.  Merit's 7-Year warranty against manufacturing defects is standard as well. Note: Other dial sizes & features available upon request.