For pressure measuring of gas, liquid which is not corrosive to brass, also where vibration and pulsation is a concern. It is suitable for drinking water system. 2-1/2" dial size, 1/4"NPT Lower mount Pressure range: 0-160psi/kpa double scale, big letters, easy to read Stainless steel case, brass wetted parts, glycerin filled Accuracy: +/-3-2-3%